What is the unit digit of 1^1! + 2^2! + 3^3! + ... + 9^9! ?

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PS · Problem Solving

705-805

Divisibility/Multiples/Factors

What is the unit digit of

1^{1!} + 2^{2!} + 3^{3!} + ... + 9^{9!}

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705-805

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