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22 September, 17:38

What is the common ratio for the geometric sequence? - 15,-9, (-27/5), (-81/25), ...

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  1. 22 September, 18:35
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    The common ratio for a geometric sequence is r=a (n+1) / an or a₂/a₁

    In this sequence: a₁=-15; a₂=-9

    r=a₂/a₁=-9/-15=3/5

    Answer: the common ratio is 3/5
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