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

If `| x| lt 1,` then the coefficient of `x ^(n)` in `(1 + 2x + 3x ^(2)+ 4x ^(3) +...) ^(1//2),` is :

A

`n`

B

`n +1`

C

`-n`

D

`-1 `

Text Solution

Verified by Experts

The correct Answer is:
D
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