Trig

What is the common ratio, r, for the sequence represented by the formula an = 3(2)^-n?


1/2
2
3
6
Is it 2?

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asked by Kiki
  1. The nth term has 2^-n, so the ratio is 2^-1 = 1/2

    Did you try listing the first few terms? That would have made it clear that 2 was not the ratio.

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    posted by Steve
  2. 1/2

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    posted by kennedy

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