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Find the coefficient of x^5 in the expan...

Find the coefficient of `x^5` in the expansion of `(1+x)^(21)+(1+x)^(22)++(1+x)^(30)dot`

A

`""^(35)C_(5)`

B

`""^(9)C_(5)`

C

`""^(31)C_(6)-""^(21)C_(6)`

D

`""^(30)C_(5)+""^(20)C_(5)`

Text Solution

Verified by Experts

The correct Answer is:
c
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