If the second and fourth term of a G.P are 8 and 32 respe...
If the second and fourth term of a G.P are 8 and 32 respectively,what is the sum of the first four terms?
28
40
48
60
68
Correct answer is D
ar = 8 .....(1)
ar3 = 32 .....(2)
r2 = 4 r = 2 ∴ a = 4
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