1.

Find the sum to n terms of the series 1 + (1 + 2) + (1 + 2 + 3) + ......

Answer»

`(n(n+1)(2n+1))/6`
`(n(n+1)(n+2))/6`
`(n(n+1)(n+2))/12`
`(n(n+1))/2`

Answer :B


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