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Picking cards (Posted on 2006-08-17) Difficulty: 3 of 5
A player picks random cards from an ordinary card deck, without returning them to the deck. How many cards should he pick so as to get at least one ace with 70% probability?

No Solution Yet Submitted by atheron    
Rating: 3.0000 (1 votes)

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answer Comment 7 of 7 |
14 cards;

if we pick 14 cards then prob. of having not a single Ace is
48C14/52C14=.2726
so having at least one ace = 1-.2726=.7274 >.7

  Posted by saurabh on 2006-08-30 16:50:46
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