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the sixth term of an arithmetic progression is 21 and the sum of the first 17 terms is 0. write the first three terms.

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2 answers
  1. a+5d=21
    17/2 (2a+16d) = 0

    The sequence is

    56, 49, 42, 35, 28, 21, 14, 7, 0, ...

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