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Find the value of the expression sum(i=1...

Find the value of the expression `sum_(i=1)^(n)sum_(j=1)^(i)sum_(k=1)^(j)1`.

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` .

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