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If |x| lt 1, then the coefficient of x^(...

If `|x| lt 1`, then the coefficient of `x^(n)` in expansion of `(1+x+x^(2)+x^(3)+…)^(2)` is

A

A) n

B

B) n-1

C

C) n+2

D

D) n+1

Text Solution

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The correct Answer is:
D
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