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  PUZZLE OF THE WEEK  
Puzzle of the week
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Puzzle #534 - Who says 13 is an UNLUCKY number?
17-Aug-18
Views : 1507
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Greg was at party playing cards with his friends. After losing 10 games in a row, he just picked up a pack of cards and flung it into the air in frustration. The pack he threw was a standard pack of cards. Each card, independently, was equally likely to land face up or face down. His friends told him they'll refund all his money if total value of the cards which landed face up is divisible by 13. Card values are assigned as follows: Ace=1, 2=2, ..., 10=10, Jack=11, Queen=12, King=13. There were no jokers. What is the probability that Greg will recover his money? Provide a detailed explanation along with your answer.
 Solution

 
 
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