Mathematics

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The 3rd and 8th term of an arithmetic progression A.P are -9 and 26.what their common difference nd first term?

  • Mathematics -

    the terms differ by 5d, so 5d=35, d=7
    a+2d = a+14 = -9, so a = -23

    -23 -16 -9 -2 5 12 19 26 33 ...

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