Question
How many terms are there in the geometric progression 6,
18, 54, 39366?Solution
First term (a) = 6 18 The total ratio (r)  T = arn-1 According to the question, 39366=6×3(n-1) 3n-1 = 6561 3n-1 = 38 (n-1) =8 Therefore n=9
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