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The n^(th) term of the sequence 1,2,...

The `n^(th)` term of the sequence 1,2,4,7,11 `………` is `…………`

A

`n^(3) +3n^(2)+2n`

B

`n^(3)-3n^(2)+3n`

C

`(n(n+1)(n+2))/3`

D

`(n^(2)-n+2)/2`

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