Math: Arithmetic Sequence.

the 3rd of an Arithmetic sequence is 8 of the 16th term is 47. Find a subed 1 and the common difference. Construct the sequence.

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  3. 12
asked by Jan
  1. a3 and a16 are 13 terms apart. So,

    13d = 47-8 = 39
    d=3

    a+2d=8, so a=2

    Now you know a and d.

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    posted by Steve

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