Find the odd one out.

4 # 5 = 81
6 # 7 = 169
3 # 4 = 49
2 # 3 = 16

Correct answer: 2 # 3 = 16

Solution

For 4 # 5 = 81, 81 = 9^2; for 6 # 7 = 169, 169 = 13^2; for 3 # 4 = 49, 49 = 7^2. These fit the pattern of (a+b)^2. But 2 # 3 = 16 = 4^2 does not match the same relation, so it is the odd one out.

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