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

If `S_n ,` the sum of first `n` terms of an A.P., is given by `S_n=5n^2+3n ,` then find its `n^(t h)` term.

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If S_n the sum of first n terms of an AP is given by 2n^2+n , then find its nth term.

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Knowledge Check

  • 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

  • If the sum of n terms of an A.P. is given by S_(n) = 5n^(2) - 3n , then the common difference of the A.P. is:

    A
    7
    B
    12
    C
    8
    D
    10

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    The sum of first n terms of an AP is given by S_n=2n^2 + 3n . Find the common difference of the AP.

    The sum of first n terms of an A.P. is 5n-n^2 . Find the n t h term of this A.P.

    Find the sum of the first 25 terms of an A.P. whose n t h term is given by a_n=2-3n .

    If the sum of first n terms of an A.P. is 3n^2 + 2n , find its r^(th) term.

    Find the sum of n terms of an A.P. whose n t h terms is given by a_n=5-6n .

    The sum of first n terms of an A.P. is 5n ^(2)+ 4n, its common difference is :

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