If 1+(1+2)/2+(1+2+3)/3+ddotto\ n terms i...

If `1+(1+2)/2+(1+2+3)/3+ddotto\ n` terms is `Sdot` Then, `S` is equal to `(n(n+3))/4` b. `(n(n+2))/4` c. `(n(n+1)(n+2))/6` d. `n^2`

`(n(n+3))/(4)`

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

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

`n^(2)`

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