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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

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

B

`.^(51)C_(5)`

C

`.^(9)C_(5)`

D

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

Text Solution

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The correct Answer is:
A
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