Find the odd number / letters / word from the given alternative:
A. 7
B. 15
C. 31
D. 57
Answer: Option D
Solution (By Examveda Team)
All other numbers expressed as a power of 2 minus one.Thus, 7 = 23 - 1, 15 = 24 - 1, 31= 25 - 1
This Question Belongs to Competitive Reasoning >> Odd Man Out
2^2 + 3 = 7
3^2 + 4 = 13
5^2 + 6 = 31
7^2 + 8 = 57
Hence answer is B since it does not follow the logic.