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Q.

The Coefficient of xn in the expression of (1+x)(1+x)n is

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a

(1−n)

b

(−1)n(1−n)

c

(−1)n(1+n)

d

(1+n)

answer is D.

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Detailed Solution

(1+x)(1+x)n=(1+x)C0 n+C1 nx+C2 nx2+……..+Cn nxn Coefficient of xn=Cn n+Cn-1 n =1+C1 n∵Cr n=Cn-r n=1+n

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