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7 July, 08:52

Write a formula for this sequence: 8,-1,-10,-19

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  1. 7 July, 10:41
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    This is an arith. sequence, and the common difference is - 9.

    a (n+1) = a (n) - 9, with a (1) = 8. Thus, if we look at the first term, we see 8; subracting 9 from 8 produces the second term (-1).
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