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Inspired by Chinmay Sangawadekar

Number Theory Level 3

Find the last four digits of \(43125^{501}.\)

Chinmay has deleted this problem because of a flaw in a solution... but it's a nice problem!

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Excel in math and science

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It's hard to learn from lectures and videos

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including olympiad champions, researchers, and professionals.

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by Otto Bretscher

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