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26-01-2017
Mathematics

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

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26-01-2017

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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