sum(r=1)^n (a^r +br) , a , b in R^+ ...

`sum_(r=1)^n (a^r +br) , a , b in R^+` is equal to :

A

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

B

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

C

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

D

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

Verified by Experts

The correct Answer is:

C

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