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Q.

The product of first n odd natural numbers equals

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a

none of these

b

12n 2nCn nPn

c

 2nCn nPn

d

14n 2nCn 2nPn

answer is B.

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Detailed Solution

1.3.5(2n1)=(2n)!2n(n!)=12n 2nCn nPn

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