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.

Assessment: JAMB UTME - Mathematics - 1998 Subject: General Mathematics

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 =  1 2 S
a + ar + ar2 =  1 2 ( a 1 − r )
2(1 + r + r)(r - 1) = 1
= 2r3 = 3
= r3 =  3 2
r( 3 2 ) 1 3  = 

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