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Find the next two terms of each sequence

15, 7,-1, -9

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2 answers

  1. keep subtracting 8

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  2. 7 - 15 = - 8

    - 1 - 7 = - 8

    - 9 - ( - 1 ) = - 9 + 1 = - 8

    This is an arithmetic progression with common difference d = - 8

    Next two term:

    - 9 - 8 = - 17

    - 17 - 18 = - 25

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