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please provide solution for the attached problem how to find n if nth term value is known in geometric progression

please provide solution for the attached problem
how to find n if nth term value is known in geometric progression
 

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Grade:8

1 Answers

Deepak Kumar Shringi
askIITians Faculty 4404 Points
6 years ago
here r=14 / -7= -2
now an= arn-1
an=224= (-7)(-2)n-1
-32=(-2)n-1
n=6

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