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If positive integers q and r are both even, which of the following must be odd?

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Junior | Next Rank: 30 Posts
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Re: If positive integers q and r are both even, which of the following must be odd?

by dollydevashryee » Fri Aug 28, 2020 11:36 am
An even number times an even number will always be even, and subtracting 1 from an even number will always be odd. Therefore, qr-1 will always be odd -> D
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