S=sum(i=1)^nsum(j=1)^isum(k=1)^j1...

`S=sum_(i=1)^nsum_(j=1)^isum_(k=1)^j1`

A

`(n(n + 1)(2n + 1))/6`

B

`[(n(n + 1))/2]^2`

C

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

D

`(n(n+1)(n+2))/6`

Verified by Experts

The correct Answer is:

D

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