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Three of the following four numbers are alike in a certain way and one is different. Which is the odd one out: 16, 25, 36, 42?

Competition practiceAnalogy & Classification

A42
B36
C16
D25

Step-by-Step Solution

16 =

4^{2}, 25 = 5^{2}

and

36 = 6^{2}

are perfect squares, but 42 is not a perfect square. So 42 is the odd one out.

Answer: A) 42

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