Discussion
Find the odd man out. 1, 4, 9, 16, 23, 25, 36
Answer: B
Each number is a perfect square.
\[ 1 = 1^{2},\; 4 = 2^{2},\; 9 = 3^{2},\; 16 = 4^{2},\; 25 = 5^{2},\; 36 = 6^{2} \]
\[ 23 \text{ lies between } 16 \text{ and } 25 \text{ and is not a square} \]
So 23 is the odd man out.
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