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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