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In the expansion of the following expres...

In the expansion of the following expression:
`1+(1+x)+(1+x)^(2)+ . . .+(1+x)^(n)`, the coefficient of `x^(k)(0leklen)` is:

A

`""^(n+1)C_(k+1)`

B

`""^(n)C_(k)`

C

`""^(n)C_(n-k-1)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
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