1.

Find the sum to n terms of the series 1+ (1+2) + (1+2+3) + (1+2+ 3+ 4) + ….:

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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