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If |x| lt1, then coefficient of x^(n) in...

If `|x| lt1,` then coefficient of `x^(n)` in expansion of: `(1+x+x^(2)+x^(3)+ . . .)^(2)` is

A

`n`

B

`n-1`

C

`n+2`

D

`n+1`

Text Solution

Verified by Experts

The correct Answer is:
D
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