sum(r=0)^n r(r+1)(r+2)(r+3) is equal to...

`sum_(r=0)^n r(r+1)(r+2)(r+3)` is equal to

A

`1/5n(n+1)(n+2) (n+3)(n+4)`

B

`1/7n (n+1)(n+2)(n+3)(n+4)`

C

`1/10n (n+1)(n+2)(n+3)(n+4)`

D

`1/2n (n+1)(n+2)(n+3)(n+4)`

Verified by Experts

The correct Answer is:

A

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