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Three positive numbers are inserted between 1 and 256 to form a G.P. What are they?
A8, 32, 128
B2, 8, 32
C4, 16, 64
D16, 64, 128
Answer & Solution
Correct answer: C. 4, 16, 64
With five terms, r^4 = 256 gives r = 4, so the inserted terms are 4, 16 and 64.
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