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We need to refer to the mathematical definition of the word "even."

The most commonly accepted definition is that a number "a" is even if there exists an integer "n" which makes the following statement true:

a = 2 x n

-1 is an integer. So let n = -1 in the above equation and we get:

-2= 2 x (-1)

So -2 satisfies the mathematical definition for being even.

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Q: Is -2 is even or odd?
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