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If a=3 and r=2 then find the sum up 5^th term.(a) 95(b) 82(c) 93(d) 97This question was addressed to me in unit test.This interesting question is from Geometric Progression(G.P.) in section Sequences and Series of Mathematics – Class 11

Answer»

The correct option is (c) 93

The explanation is: We know, Sn = a(R^N-1)/(r-1)

Here a = 3, r = 2 and n = 5

S5 = 3 (2^5-1) / (2-1) = 3(32 -1) = 3*31 = 93.


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