| Direction Find the odd number/letters/figure/number pair from the given alternatives. |
A) 7
B) 15
C) 31
D) 57
Correct Answer: D
Solution :
All other numbers can be expressed as a power of \[2-1.\] Thus, \[7={{2}^{3}}-1,\] \[15={{2}^{4}}-1,\] \[31={{2}^{5}}-1\]
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