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If the sum of n terms of an A.P. is 3n^(...

If the sum of n terms of an A.P. is `3n^(2)+5n` and its mth term is 164, find the value of m.

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The sum of n terms of AP is 3n^(2)+5n. and its nth term is 164. find the value of n.

The sum of first n terms of an A.P.is 5n^(2)+3n If its mth term is 168,(i) Find the value of m (ii) Find the 20th term of this AP

Knowledge Check

  • If the sum of first n terms of an A.P. is 3n^(2)-2n , then its 19th term is

    A
    123
    B
    118
    C
    109
    D
    107

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