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Question

The 4th term of a G.P is square of its second term and the first term is - 3. Determine the Common Ratio of the  G.P.


  1. r = -3

  2. r = -12

  3. r = -9

  4. r = -5


Solution

The correct option is A

r = -3


Given: a=3 and a4=(a2)2
ar3=(ar)2 [an=arn1]
ar3=a2r2r=ar=3

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