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d 9th term of an Ap is 52 while d 12th term is 70. find sum of it's 20th term?

  • math -

    Just answered you previous post of the same question.

    BTW, "find the sum of it's 20th term" is confusing.

    I found the 20th term.
    If you want the sum of the first 20 terms, use the values of a and d I found for you and use the formula.

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