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sum(i=1)^(n) sum(j=1)^(i)sum(k=1)^(j) 1 ...

`sum_(i=1)^(n) sum_(j=1)^(i)sum_(k=1)^(j) `1 equals `:`

A

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

B

`Sigman^(2)`

C

`""^(n)C_(3)`

D

`""^(n+2)C_(3)`

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The correct Answer is:
D
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MODERN PUBLICATION-SEQUENCES AND SERIES -MCQ ( Level-II)
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