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The value of underset(i=1)overset(n)sum...

The value of `underset(i=1)overset(n)sumunderset(j=1)overset(i)sumunderset(k=1)overset(j)sum1` is

A

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

B

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

C

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

D

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

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The correct Answer is:
D
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