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13 March, 07:29

Find the common ratio of the geometric sequence: 1,-3,9,-27,81, ...

A. 3

B. - 13

C. - 3

D. 13

+2
Answers (1)
  1. 13 March, 07:38
    0
    -3

    Step-by-step explanation:

    common ratio=a2/a1=-3/1=-3

    2.

    a1=3

    a5=48

    an=a1 r^ (n-1)

    48=3r^ (5-1)

    r^4=48/3=16=2^4

    r=2
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