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Question

The term independent of x in the expansion of (1+x)n(1+1x)n is

A
C20+C21+C22+.....+C2n
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B
2nCn
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C
1.3.5.....(2n1)n!2n
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D
all the above
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Solution

The correct option is A 2nCn

Consider given the expression,

(1+x)n(1+1x)n

(1+x)n(1+x)nxn

xn(1+x)2n

So,

Required term independent of x=coefficient of x0 inxn(1+x)2n

=coefficient of xn in (1+x)2n =2nCn


Hence, this is the answer.


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