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23-01-2018
Mathematics

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the second term in a geometric sequence is 20. the fourth term in the same sequence is 45/4 or 11.25. what is the common ratio

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Аноним Аноним

23-01-2018

4th term / second term = a1r^3 / a1r = r^2

so r^2 = 45/4 / 20 = 45/80 = 9/16

so r = sqrt 9/16 = 3/4 answer

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