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To make 1, ?, ?, ?, 256 a G.P., the three inserted numbers are:
A4, 16, 64
B2, 4, 8
C8, 32, 128
D3, 9, 27
Answer & Solution
Correct answer: A. 4, 16, 64
1. 256 is the fifth term, so r to the fourth is 256.
2. That gives r equal to 4.
3. The inserted numbers are 4, 16 and 64.
_Source: NCERT Class 11 Mathematics, Chapter 8, Sequences and Series._
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