In the following question, select the odd number pair from the given alternatives.
In the given number pairs,
2$$^2$$ = 4
3$$^2$$ = 9
5$$^2$$ = 25
Second number is square of first number.
18 is not square of 4
$$\therefore\ $$4 - 18 is the odd one among the given number pairs.
Hence, the correct answer is Option C
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