Discussion
Find the odd man out. 16, 25, 36, 72, 144, 196, 225
Answer: B
Each number is a perfect square.
\[ 16 = 4^{2},\; 25 = 5^{2},\; 36 = 6^{2},\; 144 = 12^{2},\; 196 = 14^{2},\; 225 = 15^{2} \]
\[ 72 \text{ lies between } 64 \text{ and } 81 \text{ and is not a square} \]
So 72 is the odd man out.
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