# Should it be even?

The number 2 can be expressed as the ratio of 2 positive integers: for example, $$\frac{2}{1}, \frac{4}{2},$$ or $$\frac{6}{3}.$$

Is it true that if we express 2 as the ratio $$\frac{a}{b},$$ where $$a$$ and $$b$$ are positive integers, then $$a$$ has to be an even number?

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