sum(i=1)^n sum(j=1)^t sum(k=1)^j is equa...

`sum_(i=1)^n sum_(j=1)^t sum_(k=1)^j` is equal to

A

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

B

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

C

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

D

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

Verified by Experts

The correct Answer is:

D

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