1.

Four cards are drawn successively without replacement from a well shuffled deck of 52 playing cards what is the probability that only 2 cards are spade?

Answer»

Probability of gating only 2 spade card i.e.,

P(only 2 are spades)=4Cr(1/4)r(3/4)n-r

Here, putting r=2, we get

P(only 2 are spades)=4C2(1/4)2(3/4)2

=27/128



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