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 07-17-2012, 06:31 PM #211 2010 PSOP Champion     Join Date: Feb 2010 Location: Check out my gang listing Posts: 19,997 Re: Brainteaser and math puzzle thread Spoiler: so there are 49*4 combos. remove 49 combos of FF, 43 combos of MM, 84 combos of FM, you are left with 6/20=30% Last edited by ibavly; 07-17-2012 at 06:34 PM. Reason: fixed numbers
07-17-2012, 06:34 PM   #212
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Re: Brainteaser and math puzzle thread

Quote:
 Originally Posted by ibavly also dean, lame solving riddles you've already heard of
well i didn't know if this solution applied to this riddle

also lmk if this is right for the red/blue coin flipping thing:

Spoiler:

Quote:
 Originally Posted by iversonian ah, i remember. only ONE of them is a boy born on sunday. what are the odds that both are boys.
Spoiler:

 07-17-2012, 06:35 PM #213 2010 PSOP Champion     Join Date: Feb 2010 Location: Check out my gang listing Posts: 19,997 Re: Brainteaser and math puzzle thread correct
 07-17-2012, 06:56 PM #214 FPS Allstar     Join Date: Sep 2007 Location: Triple-A: Where Ike Davis Belongs Posts: 15,476 Re: Brainteaser and math puzzle thread We should also taken into account the % of the time the babies are fraternal twins and in 100% of these cases the other one MUST be a girl, thus raising the probability the other kid is a girl slightly. lol
 07-18-2012, 01:33 AM #215 Carpal \'Tunnel     Join Date: Nov 2008 Location: that's phantastic Posts: 25,056 Re: Brainteaser and math puzzle thread fraternal twins don't have to be boy/girl
07-18-2012, 02:33 AM   #216
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Re: Brainteaser and math puzzle thread

Quote:
 Originally Posted by ibavly A couple more You have 5 coins, one of them weighs a different amount. You have a standard electronic scale, and you can use it 3 times. How do you find out a - which coin is different b - how much does it weigh 0, 2, 24, 252, 3120, ... what comes next 9, 10, 11, 12, 13, 14, 21, 100, ... Prove that N = n(n+1)(n+2)(n+3)+1 is a perfect square for any whole number n
ok i think i got it for real now

Spoiler:

 07-18-2012, 02:54 AM #217 2010 PSOP Champion     Join Date: Feb 2010 Location: Check out my gang listing Posts: 19,997 Re: Brainteaser and math puzzle thread Looks good. General idea is Spoiler: Make sure there is no coin there are no 2 coins that are in all the same equations. Bunch of different ways of doing that
07-18-2012, 03:04 AM   #218
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Re: Brainteaser and math puzzle thread

Quote:
 Prove that N = n(n+1)(n+2)(n+3)+1 is a perfect square for any whole number n
Spoiler:

07-18-2012, 07:57 AM   #219
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Quote:
 Originally Posted by PyramidScheme We should also taken into account the % of the time the babies are fraternal twins and in 100% of these cases the other one MUST be a girl, thus raising the probability the other kid is a girl slightly. lol
Wat

07-31-2012, 05:11 PM   #220
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Quote:
 Originally Posted by Aksdal fraternal twins don't have to be boy/girl
For example; Mary-Kate and Ashley are fraternal twins of the same gender.

07-31-2012, 05:32 PM   #221
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Re: Brainteaser and math puzzle thread

Quote:
 Originally Posted by pwnsall What's in my pocket?
not a fair quesssstion, precioussss!

 07-31-2012, 05:34 PM #222 Carpal \'Tunnel     Join Date: Jun 2008 Location: the depths of despair Posts: 51,874 Re: Brainteaser and math puzzle thread this question is from a math talent search thing from when I was in high school: Prove there are no 2 integers, the sum of whose squares is 12,345,678
07-31-2012, 07:29 PM   #223
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Re: Brainteaser and math puzzle thread

Quote:
 Originally Posted by Sun Tzu this question is from a math talent search thing from when I was in high school: Prove there are no 2 integers, the sum of whose squares is 12,345,678
I guess solving this algorithmically is against the spirit of the question.

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