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Inserting three numbers between 1 and 256 to form a G.P. gives r to the fourth equal to:
A16 exactly
B4 exactly
C256 exactly
D64 exactly
Answer & Solution
Correct answer: C. 256 exactly
1. 256 becomes the fifth term.
2. The fifth term is a times r to the fourth with a equal to 1.
3. So r to the fourth is 256.
_Source: NCERT Class 11 Mathematics, Chapter 8, Sequences and Series._
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