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Math riddle

 
 
Reply Mon 14 Dec, 2009 11:52 am
In the card game of preference, the deck of 32 cards(4-suit, 7-to-ace) is dealt among three players, so that every player gets 10 cards and the two remaining cards form the widow. How many ways are there to deal hands in such a way that the widow does not consist of two aces?
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Type: Question • Score: 0 • Views: 2,363 • Replies: 6
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engineer
 
  1  
Reply Mon 14 Dec, 2009 03:54 pm
@rohtarantula,
Consider the problem in reverse. Deal out a two card hand first then deal out the three ten card hands. What is the probability that the two card hand has two aces? This should be statistically equal.

The total number of two card hands is 32!/30!/2! = 465
The number of hands with two aces is 4!/2!/2! = 6 so there are 459 hands without two aces.

For the remaining 30 cards, the number of hands should be 30!/10!/10!/10!. The product of that and 459 should be the total number of hands without a dual ace widow.

I can't promise that answer is worth more than you paid.
rohtarantula
 
  1  
Reply Mon 14 Dec, 2009 05:42 pm
@engineer,
Unfortunately it is not the good answer.
engineer
 
  1  
Reply Mon 14 Dec, 2009 07:35 pm
@rohtarantula,
What do you think the answer is?
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Miss L Toad
 
  1  
Reply Mon 14 Dec, 2009 09:42 pm
@rohtarantula,
There are 4C2 ways of choosing two aces out out the 32C2 combinations

of the (32 x 31) / (1 x 2) = 496 combinations

paired aces form (4 x 3) / (1 x 2) = 6 of those combinations

hence there are 490 ways to deal two cards out of 32 cards which are not a pair of aces
solipsister
 
  1  
Reply Mon 14 Dec, 2009 09:57 pm
@rohtarantula,
yoohoo greek spider, i have a friend who's still waiting for you to confirm

the answer to your 30 july question

or don't you know the answer?
0 Replies
 
engineer
 
  1  
Reply Tue 15 Dec, 2009 07:18 am
@Miss L Toad,
Thanks! Silly math error undoes everything else.
0 Replies
 
 

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