The expressions for the sum to 'n' terms...

The expressions for the sum to 'n' terms of some arithmetic sequences are given below. Find the expression for the `n^(th)` term of each:
i) `n^(2)+2 n`
ii) `2n^(2)+n`
iii) `n^(2)-2n`
iv) `2n^(2)-n`
v) `n^(2)-n`

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