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Which one does NOT belong with the others?

Competition practiceReasoning & Mental Ability

A121
B144
C168
D169

Step-by-Step Solution

121 =

1 1^{2}, 144 = 1 2^{2}

and

169 = 1 3^{2}

are perfect squares, but 168 is not a perfect square.

Answer: C) 168

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