The coefficient of x^(10) in the expansi...

The coefficient of `x^(10)` in the expansion of `1+(1+x)+….+(1+x)^(20)` is -

A

`.^(19)C_(9)`

B

`.^(20)C_(10)`

C

`.^(21)C_(11)`

D

`.^(22)C_(12)`

Verified by Experts

The correct Answer is:

C

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