1.

For any integer n ge 1, then sum_(k=1)^(n) k ( k+2) is equal to

Answer»

`(N (n+1) (n+2) )/( 6)`
`(n (n+1) (2n+1) )/( 6) `
`( n ( n+1) (2n+7) )/(6)`
`(n (n+1) (2n+9) )/( 6)`

ANSWER :C


Discussion

No Comment Found