Discussion
Find the odd man out. 1, 4, 9, 16, 20, 36, 49
Answer: C
Each number is a perfect square.
\[ 1,\; 4,\; 9,\; 16,\; 36,\; 49 = 1^{2},\, 2^{2},\, 3^{2},\, 4^{2},\, 6^{2},\, 7^{2} \]
\[ 20 \text{ is not a square} \]
So 20 breaks the run. Note that \( 5^{2} = 25 \) is missing from the list, and 20 has been slipped in where it would have stood.
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