New Logic/Math Puzzles Latest Questionshttp://brainden.com/forum/forum/7-new-logicmath-puzzles/New Logic/Math Puzzles Latest QuestionsenBraindencom-NewPuzzleshttps://feedburner.google.comSubscribe with My Yahoo!Subscribe with NewsGatorSubscribe with My AOLSubscribe with BloglinesSubscribe with NetvibesSubscribe with GoogleSubscribe with PageflakesMore heads?http://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/MQ8Py0tM8j4/<p>
<span style="color:#000000;">Player A has one more coin than player B. Both players throw all of their coins simultaneously and observe the number that come up heads. Assuming all the coins are fair, what is the probability that A obtains more heads than B?</span>
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/MQ8Py0tM8j4" height="1" width="1" alt=""/>17915Sun, 26 Mar 2017 03:33:47 +0000http://brainden.com/forum/topic/17915-more-heads/Hard riddlehttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/Wtw6Ru697sw/<p>
Please help me solve this riddle. The answer is 30 but i dont know the solution.
</p>
<p><a href="http://brainden.com/forum/uploads/monthly_2017_03/Screenshot_20170312-153026.png.88f1b0b2f0e4d052aefd436ec5fbc796.png" class="ipsAttachLink ipsAttachLink_image"><img data-fileid="4461" src="http://brainden.com/forum/uploads/monthly_2017_03/Screenshot_20170312-153026.thumb.png.a4d0bbbf98ba2c3607b2be672dc0f8fb.png" class="ipsImage ipsImage_thumbnailed" alt="Screenshot_20170312-153026.png"></a></p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/Wtw6Ru697sw" height="1" width="1" alt=""/>17911Sun, 12 Mar 2017 16:05:41 +0000http://brainden.com/forum/topic/17911-hard-riddle/Math Riddlehttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/aunQqI2SAJ8/<p>
There are originally five white goats and seven black goats. Then a tiger eats two goats of each color. After the tiger has eaten, what is the multiplication or product of the number of white and black goat?
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/aunQqI2SAJ8" height="1" width="1" alt=""/>17908Wed, 08 Mar 2017 11:51:00 +0000http://brainden.com/forum/topic/17908-math-riddle/Janis Puzzlehttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/Z8FU8vFuslo/<p>
New Cryptographic Puzzle by the Decred Project
</p>
<p>
<span>High resolution image download hosted at <a href="https://decred.org/januspuzzle/" rel="external nofollow">https://decred.org/januspuzzle/</a></span>
</p>
<p>
<span>The high resolution image contains secret information.</span>
</p>
<p>
<span>There are others attempting to solve the puzzle on the Decred Slack, on the #puzzles channel. </span>
</p>
<p>
<span>This text was included in the announcement tweet:</span>
</p>
<p>
<span>"A tree that does not bend will inevitably break. The repository unit is corrupt. Begin." <a href="https://twitter.com/decredproject/status/839204577920565248" rel="external nofollow">https://twitter.com/decredproject/status/839204577920565248</a></span>
</p>
<p>
<span>Current Prize Value: $1500</span>
</p>
<p><a href="http://brainden.com/forum/uploads/monthly_2017_03/janus-preview.jpg.63d4486079bd1d00753c39475abf86c4.jpg" class="ipsAttachLink ipsAttachLink_image"><img data-fileid="4460" src="http://brainden.com/forum/uploads/monthly_2017_03/janus-preview.jpg.63d4486079bd1d00753c39475abf86c4.jpg" class="ipsImage ipsImage_thumbnailed" alt="janus-preview.jpg"></a></p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/Z8FU8vFuslo" height="1" width="1" alt=""/>17910Sun, 12 Mar 2017 01:58:43 +0000http://brainden.com/forum/topic/17910-janis-puzzle/Palindromes by multiplicationhttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/IzvUn6ruERs/<p>
A palindrome is a number which reads the same backward or forward (e.g. 434, 87678, etc.). Could you prove that for any integer n (not divisible by 10) there is a palindrome divisible by n?
</p>
<p>
***
</p>
<p>
I've checked for all numbers up to 162, it's true:
</p>
<p>
81* 12345679= 999999999
</p>
<p>
172839506*162=27999999972
</p>
<p>
</p>
<p>
Is there any simple proof for any integer?
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/IzvUn6ruERs" height="1" width="1" alt=""/>17899Sun, 12 Feb 2017 18:14:00 +0000http://brainden.com/forum/topic/17899-palindromes-by-multiplication/Show 4 divides this algebraic expression.http://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/JtNqwMTvszg/<p>
Let w, x, y, and z belong to the complete set of integers.
</p>
<p>
If each of wxy + z^2, wxz + y^2, wyz + x^2, xyz + w^2 is divisible by 4, show that
</p>
<p>
w^3 + x^3 + y^3 + z^3 is divisible by 4.
</p>
<p>
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/JtNqwMTvszg" height="1" width="1" alt=""/>17902Mon, 27 Feb 2017 04:14:02 +0000http://brainden.com/forum/topic/17902-show-4-divides-this-algebraic-expression/Show an algebraic expression is divisible by 4.http://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/9RVc60RIdsY/<p>
Let w, x, y, and z belong to the complete set of integers.
</p>
<p>
If each of wxy + z^2, wxz + y^2, wyz + x^2, xyz + w^2 is divisible by 4, show that
</p>
<p>
w^3 + x^3 + y^3 + z^3 is divisible by 4.
</p>
<p>
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/9RVc60RIdsY" height="1" width="1" alt=""/>17901Mon, 27 Feb 2017 04:13:45 +0000http://brainden.com/forum/topic/17901-show-an-algebraic-expression-is-divisible-by-4/1000 people in a circlehttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/BdcGcGNdK-g/<p>
1000 people are standing in a circle, all numbered from 1 to 1000.
</p>
<p>
Person 1 has sword with which he kills person 2 gives the sword to person 3.
</p>
<p>
Person 3 kills person 4 and passes the sword to person 5.
</p>
<p>
Every time the person who has the sword kills the next person in the circle and passes the sword.
</p>
<p>
This is continued till there is only one person alive.
</p>
<p>
Who is the Last Man Standing?
</p>
<blockquote class="ipsStyle_spoiler" data-ipsspoiler="">
<div class="ipsSpoiler_header">
<span>Spoiler</span>
</div>
<div class="ipsSpoiler_contents">
<p>
Person : 977
</p>
<p>
Can you derive a general formula and also a general method for any value of initial number of person.
</p>
</div>
</blockquote><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/BdcGcGNdK-g" height="1" width="1" alt=""/>7688Tue, 14 Apr 2009 14:34:58 +0000http://brainden.com/forum/topic/7688-1000-people-in-a-circle/Bisecting a trianglehttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/Z9rJU3I4Itw/<p>
<span style="font-family:Verdana,Geneva,sans-serif;">A triangle has sides of length {1, 1, sqrt(2)}. </span>
</p>
<p>
<span style="font-family:Verdana,Geneva,sans-serif;">What is the length of the shortest cut that divides the triangle into two pieces that have equal areas?</span>
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/Z9rJU3I4Itw" height="1" width="1" alt=""/>17904Tue, 28 Feb 2017 08:54:33 +0000http://brainden.com/forum/topic/17904-bisecting-a-triangle/Who served first?http://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/Y9lFR2q32qc/<p>
<span style="font-family:Georgia,serif;"><em><strong>Araver</strong></em></span><span style="font-family:Verdana,Geneva,sans-serif;"> beat </span><em><strong><span style="font-family:Georgia,serif;">plasmid</span></strong></em><span style="font-family:Verdana,Geneva,sans-serif;"> in a set of tennis, winning six games to </span><em><strong><span style="font-family:Georgia,serif;">plasmid</span></strong></em><span style="font-family:Verdana,Geneva,sans-serif;">'s three.<br>
There were five service breaks (games in which the serving player lost.) </span>
</p>
<p>
<span style="font-family:Verdana,Geneva,sans-serif;">Who served the first game? </span><br>
</p>
<p>
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/Y9lFR2q32qc" height="1" width="1" alt=""/>17903Mon, 27 Feb 2017 10:29:43 +0000http://brainden.com/forum/topic/17903-who-served-first/A Nine Puzzlehttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/7bC-3omPsmI/<p>Use three 9's and arrange them using the mathematical signs to form the number one.</p><blockquote class="ipsStyle_spoiler" data-ipsspoiler=""><p>There is a subtraction sign.</p></blockquote><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/7bC-3omPsmI" height="1" width="1" alt=""/>15967Mon, 11 Mar 2013 12:19:25 +0000http://brainden.com/forum/topic/15967-a-nine-puzzle/matchstick puzzlehttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/TSxxBT44iag/<p>If you have a total number of 24 matchsticks in squares and you have to remove 6 of them and make 3 squares with the rest of them, how would you do this and can you give me a visual solution please...</p><p> </p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/TSxxBT44iag" height="1" width="1" alt=""/>17581Mon, 23 Nov 2015 09:40:19 +0000http://brainden.com/forum/topic/17581-matchstick-puzzle/Darknesshttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/XuTHIJ_7vPQ/<p>
It is what lies in the darkness,
</p>
<p>
not what you see.
</p>
<p>
If ALPHA equals 1 6 6 4 1 1 3 1,
</p>
<p>
And OMEGA equals 1 5 8 4 1 2 5 1,
</p>
<p>
Half of their sum
</p>
<p>
will lead you to me.
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/XuTHIJ_7vPQ" height="1" width="1" alt=""/>17898Tue, 07 Feb 2017 03:57:18 +0000http://brainden.com/forum/topic/17898-darkness/Last night at Morty's - Alex's weird diehttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/uPaKFOcsKzk/<p>Another quiet night at Morty's. Until Alex came in.</p><p>
</p><p>
I bought a bunch of factory reject dice the other day, he said. </p><p>
They're OK except the numbers are all wrong. Mostly they have </p><p>
extra two's and three's, but <strong>this</strong> one [he held one up, far enough </p><p>
away so the numbers could not be read] has all different numbers. </p><p>
</p><p>
Still, the numbers aren't 1-6.</p><p>
</p><p>
I have a wager for anyone here who thinks he's a genius.</p><p>
I'll roll the thing three times against that wall over there.</p><p>
The bottom and back die faces won't be visible, but I'll give </p><p>
you the <span style="color:#800000">sum of the four faces that are visible</span>.</p><p>
As a bonus, I'll give you the <span style="color:#0000ff">sum of the top and front faces</span>.</p><p>
</p><p>
I'll buy a pint for anyone who can tell me all six numbers on the die.</p><p>
If you try and can't figure it out, you'll buy me a pint.</p><p>
</p><p>
He rolled the die three times and called out the numbers:</p><p>
</p><p>
Roll #1 = <span style="color:#800000">28</span> and <span style="color:#0000FF">18</span></p><p>
Roll #2 = <span style="color:#800000">18</span> and <span style="color:#0000FF">7</span></p><p>
Roll #3 = <span style="color:#800000">22</span> and <span style="color:#0000FF">6</span></p><p>
</p><p>
Jim thought for a while, then said, no way. There's too many possibilities. </p><p>
So did Ian and Jamie.</p><p>
</p><p>
Davey paused to scratch his beard and said, I'll try.</p><p>
</p><p>
Would you have taken the bet?</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/uPaKFOcsKzk" height="1" width="1" alt=""/>603Fri, 12 Oct 2007 09:43:48 +0000http://brainden.com/forum/topic/603-last-night-at-mortys-alexs-weird-die/Mystery Operation Vhttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/uhU0wZ3bhe4/<p>
<em>The series is back(*). </em>
</p>
<p>
As we're still expanding in the universe, a small scout ship has encountered an anomaly near a binary system that has no planets only a few belts of asteroids. Getting closer to the system, they found the anomaly is centered in what seems to be an abandoned mining facility of alien design.
</p>
<p>
The crew landed and started exploring the corridors of the facility. No alien was to be found, except for some strange markings in all the corridors. Each corridor has two lines of dots parallel to each other, repeating along the corridor. Each corridor ends with a wall where another yet another series of dots is inscribed. All except one corridor that has no dots. Scans indicate that there is nothing behind the walls at the end of all corridors except for the one with no markings.
</p>
<p>
No guide or manual is available of course, but it stands to reason that some sort of alien algorithm or simple operation is behind this. So the crew noted all the number of dots in the corridors and walls, returned to the ship and unpacked their coffee reserves. This is going to take awhile...
</p>
<p>
Can <strong>you</strong> help them decipher it? (Blue and Red are number of dots in the first and second line along the corridors while purple dots can be found on the wall at the end of the corridor)
</p>
<p>
<strong><span style="color:#0000ff;">12</span> ||| <span style="color:#ff0000;">4</span> = <span style="color:#800080;">4</span></strong><br /><strong><span style="color:#0000ff;">7</span> ||| <span style="color:#ff0000;">3</span> = <span style="color:#800080;">8</span><br /><span style="color:#0000ff;">8</span> ||| <span style="color:#ff0000;">11</span> = <span style="color:#800080;">12</span><br /><span style="color:#0000ff;">5</span> ||| <span style="color:#ff0000;">6</span> = <span style="color:#800080;">6</span><br /><span style="color:#0000ff;">2</span> ||| <span style="color:#ff0000;">3</span> = <span style="color:#800080;">3</span><br /><span style="color:#0000ff;">18</span> ||| <span style="color:#ff0000;">19</span> = <span style="color:#800080;">24</span><br /><span style="color:#0000ff;">7</span> ||| <span style="color:#ff0000;">11</span> = <span style="color:#800080;">16</span></strong>
</p>
<p>
<strong><span style="color:#0000ff;">27</span> ||| <span style="color:#ff0000;">24</span> = <span style="color:#800080;">?</span></strong>
</p>
<div class="ipsSpoiler" data-ipsspoiler="">
<div class="ipsSpoiler_header">
<span>Spoiler</span>
</div>
<div class="ipsSpoiler_contents">
<p>
(*) Past challenges (no need to solve them to solve this one, but if you liked this one you'll probably like those too :P)
</p>
<p>
<a href="http://brainden.com/forum/topic/12908--/" rel="">Mystery Operation I</a> solved by k-man
</p>
<p>
<a href="http://brainden.com/forum/topic/13041--/" rel="">Mystery Operation II</a> solved by plainglazed
</p>
<p>
<a href="http://brainden.com/forum/topic/13160--/" rel="">Mystery Operation III</a> solved by curr3nt and plainglazed.
</p>
<p>
<a href="http://brainden.com/forum/topic/13315--/" rel="">Mystery Operation IV</a> solved by leakysheep.<br />
</p>
<p>
</p>
</div>
</div>
<p>
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/uhU0wZ3bhe4" height="1" width="1" alt=""/>17810Sun, 21 Aug 2016 16:17:02 +0000http://brainden.com/forum/topic/17810-mystery-operation-v/Prove or disprove 0.0000.....001 equals 0http://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/GCARGLgXVvA/<p>
Prove or disprove that 0.000....000001 equals 0
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/GCARGLgXVvA" height="1" width="1" alt=""/>17894Fri, 20 Jan 2017 15:24:08 +0000http://brainden.com/forum/topic/17894-prove-or-disprove-00000001-equals-0/Binary lockhttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/JEU0DYLIb5k/<p>
There are n binary levers: each lever can be in position <em>0</em> or position <em>1</em>.<br />
Exactly one out of 2<sup>n</sup> possible combinations of levers opens the lock.<br />
The lock opens immediately as soon as each lever is in proper position.<br />
Changing position of one lever is called a <em>move</em>.<br />
Suppose all levers are initially in position <em>0</em>.<br />
What is the minimal number of moves that guarantees opening the lock?<br />
In other words: how many moves are required to test each position of levers (the worst case scenario)?
</p>
<p>
Can you also describe the optimal procedure of moving the levers?
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/JEU0DYLIb5k" height="1" width="1" alt=""/>17890Tue, 10 Jan 2017 09:11:16 +0000http://brainden.com/forum/topic/17890-binary-lock/Fill in the Sequencehttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/zv1PdNKdxXQ/<p>
The first number is the lowest possible answer, the dots represent a series of numbers that fit the sequence. Give the 3 blanks in the sequence. You might have to think alittle off the wall *wink* to come up with the pattern.
</p>
<p>
2, 3, 5, 20, 26.......... 929, 930, 936, 939, 948, 950, 956, ______, _______, ______....2038, 2058.....
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/zv1PdNKdxXQ" height="1" width="1" alt=""/>17888Sat, 31 Dec 2016 18:56:08 +0000http://brainden.com/forum/topic/17888-fill-in-the-sequence/What are the next two numbers in sequence 176, 184, 186, 190, 192, 194, 198, 200, ?, ?http://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/R6F4oMLxmkQ/<p>
What are the next two numbers in sequence
</p>
<p>
176, 184, 186, 190, 192, 194, 198, 200, ?, ?
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/R6F4oMLxmkQ" height="1" width="1" alt=""/>17885Wed, 28 Dec 2016 20:12:31 +0000http://brainden.com/forum/topic/17885-what-are-the-next-two-numbers-in-sequence-176-184-186-190-192-194-198-200/Celebrity Interviewhttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/1ckRB-SeJwk/<p>
So you're a writer, Bill. Care to share some of your work?
</p>
<p>
Sure. Here are a few bits of it: FF?
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/1ckRB-SeJwk" height="1" width="1" alt=""/>17848Wed, 26 Oct 2016 09:44:17 +0000http://brainden.com/forum/topic/17848-celebrity-interview/Arrange numbers to the equations, so if we turn the equations upside down, they are still righthttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/O2pQS-9tYMw/<p>
<img alt="7 digit numbers puzzle.png" class="ipsImage ipsImage_thumbnailed" data-fileid="4452" src="http://brainden.com/forum/uploads/monthly_2016_12/5845316ad96d1_7digitnumberspuzzle.png.e50d9628529cfa5458c730c963f5d292.png" /></p>
<p>
_ + _ = _
</p>
<p>
_ + _ = _
</p>
<p>
_ + _ = _
</p>
<p>
_ + _ = _
</p>
<p>
</p>
<p>
Fill the blanks with numbers above, so:
</p>
<ul><li>
The 4 equations are right.
</li>
<li>
All numbers must be used.
</li>
<li>
If we turn the equations upside down, they are still right.
</li>
<li>
You can rotate any numbers too, example 1091 -> 1601.
</li>
</ul><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/O2pQS-9tYMw" height="1" width="1" alt=""/>17881Mon, 05 Dec 2016 09:22:34 +0000http://brainden.com/forum/topic/17881-arrange-numbers-to-the-equations-so-if-we-turn-the-equations-upside-down-they-are-still-right/Perfect Pairs/Trioshttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/eY46fXiLL2g/<p>Consider the following definitions of perfect pairs/trios. If there exist such numbers that fit the definition show how many exist, if no number exists, provide a proof: (Each number is assumed to be distinct)</p>
<p> </p>
<p>1. When you add two numbers you get a certain answer. Using the same two numbers, subtract the larger from the smaller and get the same answer in the first sentence.</p>
<p> </p>
<p>2. Using three numbers, add the first two numbers together then divide the sum by the third number. The result will be one of the three numbers.</p>
<p> </p>
<p>3. Two numbers whose sum is equal to their quotient.</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/eY46fXiLL2g" height="1" width="1" alt=""/>16944Tue, 22 Apr 2014 13:47:14 +0000http://brainden.com/forum/topic/16944-perfect-pairstrios/Probability of missing the circlehttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/3rkOJ7prt4Q/<p>
Since nobody was brave enough to attack my 'bum' question, here is one that sounds more 'mathy'...
</p>
<p>
</p>
<p>
Suppose you have a box with a square base area of 16 square inches. There is a circle drawn inside the base which shares the same center point. The diameter of this circle is 2 inches. Lastly, assume that you have a line segment with length of 1 inch which will randomly appear within the base of the box. What is the probability that this line segment will not intersect the circle?
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/3rkOJ7prt4Q" height="1" width="1" alt=""/>17876Wed, 30 Nov 2016 20:40:50 +0000http://brainden.com/forum/topic/17876-probability-of-missing-the-circle/Replace letters with numbers 1 to 9, so the 3 operations are equalshttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/hrgQFPHsW8M/<p>
Replace letters with numbers 1 to 9, so the 3 operations below are equals. Each letter represents one unique number.<br /><strong><span style="font-size:14px;"> ab / c = de * f = gh - i</span></strong>
</p>
<p>
<span style="font-size:14px;">Note : </span>
</p>
<ul><li>
<span style="color:rgb(34,34,34);font-family:Arial, 'Helvetica Neue', Helvetica, sans-serif;font-size:13px;font-style:normal;font-weight:normal;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);float:none;"><span>I</span>f a = 1, and b = 2, then ab = 12 <strong>NOT</strong></span><strong><strong> </strong>multiplication</strong>
</li>
<li>
It is more fun if you solve this without computer, trust me this is easy.
</li>
</ul><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/hrgQFPHsW8M" height="1" width="1" alt=""/>17875Wed, 30 Nov 2016 05:46:26 +0000http://brainden.com/forum/topic/17875-replace-letters-with-numbers-1-to-9-so-the-3-operations-are-equals/The Donny Hall puzzlehttp://feedproxy.google.com/~r/Braindencom-NewPuzzles/~3/UtxHIRgvGAo/<p>
Monty Hall was out sick today, so his brother Donny Hall filled in as the host of Let's Make a Deal. But people quickly discovered why Monty was chosen as the regular host in the first place. It was a bad sign when Donny asked a contestant "Would you like to keep that $100, or trade it for the trip to Hawaii inside the mystery box?" Worse was when he offered prizes for drawing a heart or spade and zonks for drawing a diamond or club, but presented the deck of cards face-up for contestants to draw from. Although the producers are sobbing with their heads in their hands off in the production booth, they haven't yet had a commercial break to give young Donny a crash course in hostmanship. And now he comes to you with an offer to win a car, a donkey, or a lifetime supply of air behind doors #1, #2, or #3. You choose door #2. Donny continues with "All right, the first door you didn't pick was door #1 so let's see what's behind that door." It's opened to reveal a lifetime supply of air.
</p>
<p>
Now you're given the chance to stay with door #2 or switch to door #3. (Donny also offered the chance to switch to door #1, but let's ignore that option for the purpose of this puzzle.) Which door should you pick?
</p><img src="http://feeds.feedburner.com/~r/Braindencom-NewPuzzles/~4/UtxHIRgvGAo" height="1" width="1" alt=""/>17868Tue, 22 Nov 2016 15:59:07 +0000http://brainden.com/forum/topic/17868-the-donny-hall-puzzle/