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

If the sum of the first n terms of an A.P. is `1/2(3n^2+7n)`, then find its nth term. Hence write its 20th term.

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Knowledge Check

  • If the sum of n terms of an A.P. is 2n^(2)+5n , then its n^(th) term

    A
    A. `4n-3`
    B
    B. `3n-4`
    C
    C. `4n+3`
    D
    D. `3n +9`

  • If the sum of first n terms of an A.P. is given by S_(n)=3n^(2)-4n, then its seventh term is:

    A
    119
    B
    73
    C
    41
    D
    35

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