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The coefficient of x^(5) in the expansi...

The coefficient of `x^(5)` in the expansion of
`(1+x)^(21)+(1+x)^(22)+.. .+(1+x)^(30)` is

A

`51 C_(5) `

B

`9 C_(5) `

C

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

D

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

Text Solution

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The correct Answer is:
D
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HIMALAYA PUBLICATION-BINOMIAL THEOREM-QUESTION BANK
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