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15 June, 12:21

Does the following series converge or diverge 7-21+63-189

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Answers (2)
  1. 15 June, 15:32
    0
    The common ratio is:

    -21/7=63/-21=-3

    So r=-3

    A series only converges if r^2<1, since r^2 in this case is 9, the series diverges.
  2. 15 June, 15:47
    0
    It is converge because it is an infinite sequence
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