1.

For anyinteger n ge 1, underset(k=1) overset(n) sumK ( K+2)=

Answer»

`(N(n+1)(n+2))/(6)`
`(n(n+1)(2n+7))/(6)`
`(n(n+1)(2n+1))/(6)`
`(n(n-1)(2n+8))/(6)`

ANSWER :B


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