Given that the first and forth terms of G.P are 6 and 162...
Given that the first and forth terms of G.P are 6 and 162 respectively, find the sum of the first three terms of the progression
27
8
78
48
Correct answer is C
a=6,U4=162U4=ar4−1U4=ar3162=6(r)3r3=27r=3√27r=3S4=a(rn−1)r−1=6(33−1)3−1=6(27−1)2=3×26=78
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