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The sum of the 3rd and 7th term of an A.P is 38 and the 9th term is 37..Find the first term and common difference

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asked by benita
  1. just set up the equations:

    a+2d + a+6d = 38
    a+8d = 37

    Now just solve for a and d.

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    posted by Steve
  2. a=1;d=9/2

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    posted by tinah

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