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Q.

A group of 2n students consisting of n boys and n girls are to be arranged in a row such that adjacent members are of opposite sex. The number of ways in which this can be done is

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a

2(n!)

b

(n!)

c

2(n!)2

d

n!

answer is C.

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Detailed Solution

. There are following ways for the photograph.M1W1M2W2…MnWnor W1M1W2M2…WnMnThis can be done in (2) (n!) (n!) = 2(n!)2 way.
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