Solve for x

The book say when .

Why is this? And how am I supposed to use this to solve this problem?

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- Jun 26th 2010, 08:33 PMdwsmith1!+2!+...+1000! \equiv x (mod 10)
Solve for x

The book say when .

Why is this? And how am I supposed to use this to solve this problem? - Jun 26th 2010, 08:42 PMundefined