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Find the sum of first 20 terms of the ar...

Find the sum of first 20 terms of the arithmetic progression having the sum of first 10 terms as 52 and the sum of the first 15 terms as 77.

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Find the sum of the first 20 terms of the arithmetic progression having the sum of first ten terms as 52 and the sum of the first 15 terms as 77.

Find the sum of the first 20-terms of the arithmetic progression having the sum of first 10 terms as 52 and the sum of the first 15 terms as 77.

Knowledge Check

  • An infinite G.P has first 13 term as a and sum 5 , then

    A
    `a lt - 10`
    B
    `-10 lt a lt 0`
    C
    `0 lt a lt 10`
    D
    `a gt 10`

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