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The value of sum(r=0)^n(a+r+a r)(-a)^r i...

The value of `sum_(r=0)^n(a+r+a r)(-a)^r` is equal to `(-1)^n[(n+1)a^(n+1)-a]` b. `(-1)^n(n+1)a^(n+1)` c. `(-1)^n((n+2)a^(n+1))/2` d. `(-1)^n(n a^n)/2`

A

`(-1)^(n)[(n + 1)a^(n+1) - a]`

B

`(-1)^(n)(n + 1)a^(n+ 1)`

C

`(-1)^(n) (n + 2)a^(n+ 1))/(2)`

D

`(-1)^(n)(na^(n))/(2)`

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The correct Answer is:
B
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DISHA PUBLICATION-SEQUENCES AND SERIES -EXERCISE -1 : Concept Builder
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