1.

1+ (1+3) + (1+3+ 5) + ….n brackets =

Answer»

`(n (n+1) (n+2) )/( 6) `
`(n (n +1) (3n^(2) + 23n + 46))/( 12)`
`(n(27n^(3) + 90n^(2) + 45n- 50))/( 4)`
`(n (n+1) (2n +1) )/( 6)`

ANSWER :D


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