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If \(m\) and \(n\) are positive integers such that \(m > n,\) what is the remainder when \(m^2 – n^2\) is divided by

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by Gmat_mission » Sat Jun 06, 2020 5:11 am

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If \(m\) and \(n\) are positive integers such that \(m > n,\) what is the remainder when \(m^2 – n^2\) is divided by \(21?\)

1. The remainder when \(m + n\) is divided by \(21\) is \(1.\)

2. The remainder when \(m – n\) is divided by \(21\) is \(1.\)

[spoiler]OA=C[/spoiler]

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