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Because the second number from an odd number is odd, and every other number is an odd number. In fact, if you add or subtract an even number with any number, the result keeps the same parity as the other number. So an odd number minus an even number is odd, while an even number minus and even number is even.

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โˆ™ 2012-09-21 00:43:25
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Q: Why is and odd number minus an even number odd?
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