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16 February, 13:40

If the fourth term of a geometric progression is

-81/2 and the fifth term is 243/2 find a1 and r?

+1
Answers (1)
  1. 16 February, 15:16
    0
    Step-by-step explanation:

    hello:

    the common ratio is : A5/A4 = (-243/2) / -81/2) = (-243/2) * (2/-81) = 243/81 = 3
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