Question 1 Report
The sum of the first three terms of a geometric progression is half its sum to infinity. Find the positive common ratio of the progression.
Answer Details
Let the G.P be a, ar, ar2, S3 = 12 1 2 S a + ar + ar2 = 12 1 2 (a1−r a 1 − r ) 2(1 + r + r)(r - 1) = 1 = 2r3 = 3 = r3 = 32 3 2 r(32 3 2 )13 1 3 = √32
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