additional mathematics

if the 2nd term and the 4th term of an arithmetic progression are 15 and 23 respectively, find the first term and the common difference

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asked by yoyo
  1. just use the formulas you know:

    a+d = 15
    a+3d = 23

    Note that T2 and T4 differ by 2d=8.

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    posted by Steve

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