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The n^(th) term of the sequence 1, 2, 4,...

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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