1.

If 1 + (1 + 2)/2 + (1 + 2 + 3)/3 + ...... to n terms is s, then s is equal to

Answer»

`(n(n + 3))/4`
`(n(n + 2))/4`
`(n(n + 1)(n + 2))/6`
`n^(2)`

ANSWER :A


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