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Which one of these numbers is not like the others 25,16,49,63,81

Which one of these numbers is not like the others 25,16,49,63,81-example-1
User Robz
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2 Answers

3 votes
It's 16, the first number is odd and the second number is even, unlike the others.

That's what I think.
User Gnganapath
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3 votes
25,16,49,63,81

It's 63. Why?
We notice that each number is a perfect square at the exception of 63:

5² =25
4² =16
7² =49
9² =81, so the number 63 which is 7 x 9 is the odd man in this series

User Estefanie
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