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Mathematics, 15.04.2020 15:27 potatogirl9300

Let $n$ be an integer greater than 0. The numbers $1, 2, 3, \ldots, n$ are written on a blackboard. We decide to erase from the blackboard any two numbers, and replace them with their nonnegative difference. After this is done several times, a single number remains on the blackboard. For which values of $n$ can this number equal 0

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