Question

A bag contains n white and n red balls. Pairs of balls are drawn with out replacement until the bag is empty. The probability that each pair consists of one white and one red ball is

- (∠n)2.2n∠2n

- ∠n.∠n∠2n.2n−1

- (∠n).2n∠2n

- (∠n).2n−1∠2n

Solution

The correct option is **A** (∠n)2.2n∠2n

n(s)=2nC2.2n−2C2....2C2n(E)=n2(n−1)2(n−2)2...12=(∠n)2

n(s)=2nC2.2n−2C2....2C2n(E)=n2(n−1)2(n−2)2...12=(∠n)2

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