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20 May, 19:34

Which of the following is not a geometric sequence?

1,-3,9,-27,81

-7,-5.8,-4.6,-3.4,-2.2

-100 - 20 - 4, 4/5, 4/25

2.8,6.72,16.128,38.7072

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Answers (1)
  1. 20 May, 22:27
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    -7,-5.8,-4.6,-3.4,-2.2

    Step-by-step explanation:

    A geometric sequence must have a common ratio.

    -3 / 1 = - 3

    9 / - 3 = - 3

    -27 / 9 = - 3

    81 / - 27 = - 3

    The first sequence is a geometric sequence.

    -5.8 / - 7 = 0.829 ...

    -4.6 / - 5.8 = 0.793 ...

    The second sequence is not a geometric sequence (it is an arithmetic sequence with a common difference of 1.2).
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