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Between 1 and 256 the real values of r that work are:
A2 and minus 2
B8 and minus 8
C16 and minus 16
D4 and minus 4
Answer & Solution
Correct answer: D. 4 and minus 4
1. r to the fourth equals 256.
2. Both 4 and minus 4 raised to the fourth give 256.
3. Only real roots are taken.
_Source: NCERT Class 11 Mathematics, Chapter 8, Sequences and Series._
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