Irw2Darri0elena Irw2Darri0elena

14-12-2016
Mathematics

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A bridge hand is made up of 13 cards from a deck of 52. Find the probability that a hand chosen at random contains at least 3 nines.

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HomertheGenius HomertheGenius

19-12-2016

A deck of 52 hours has 4 nines.
P ( x ≥ 3 ) = ( 48 C 10 · 4 C 3 ) / ( 52 C 13 ) + ( 48 C 9 · 4 C 4 ) / ( 52 C 13 ) =
= 0.0412 + 0.588 = 0.1
Answer:
The probability is 0.1 ( or 10%).

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