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Number Theory Level 3

What are the last three digits of the alternating sum \[ 2014! - 2013! + 2012! - 2011! +...+ 4! - 3! + 2! - 1! ? \]

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Excel in math and science

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It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

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including olympiad champions, researchers, and professionals.

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by Nicholas Tomlin

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