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13 December, 16:52

The next term in the geometric sequence - 1, - 2, - 4, ... is - 6.

True or False

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Answers (1)
  1. 13 December, 19:21
    0
    False

    because

    r=2

    so

    an=a1r^ (n-1)

    a4 = (-1) (2^ (4-1))

    = (-1) (2^3)

    = (-1) (8)

    =-8

    so a4 equals - 8 not - 6
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