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If the sum of the first n terms of an AP...

If the sum of the first n terms of an AP is `4n-n^(2)` , what is the first term (remember the first term is `S_(1)`)? What is the sum of first two terms? What is the second term? Similarly, find the `3^(rd)`, the `10^(th)` and the `n^(th)` terms.

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The correct Answer is:
`S_(1)=3;" "S_(2)=4;" "a_(2)=1;" "a_(3)=-1;" "a_(10)=-15" "a_(n)=5-2x`
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