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Which number does not belong with the others: 16, 49, 81, 98, 121?

Competition practiceReasoning & Mental Ability

A49
B81
C98
D121

Step-by-Step Solution

16 =

4^{2}, 49 = 7^{2}, 81 = 9^{2}

and

121 = 1 1^{2}

are perfect squares; 98 is not a perfect square.

Answer: C) 98

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