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`

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