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17 September, 02:27

What are the geometric series of a1 and r of the geometric series?

2-2+2-2+2

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Answers (1)
  1. 17 September, 05:33
    0
    a1=2 and r=-1

    Step-by-step explanation:

    Given

    geometric series = 2-2+2-2+2

    geometric sequence has a constant ratior r and is given by

    an=a1r (r) ^ (n-1)

    where

    an=nth term

    r=common ratio

    n=number of term

    a1=first term

    In given series:

    r = a (n+1) / an

    = a (2) / a1

    = - 2/2

    =-1

    so a1=2 and r=-1!
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