Q.

The product of first n odd natural numbers equals

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a

2nCn nPn

b

12n 2nCn nPn

c

14n 2nCn 2nPn

d

none of these

answer is B.

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Detailed Solution

1.3.5…(2n−1)=(2n)!2n(n!)=12n 2nCn nPn
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