Expressing a Factorial

\left (1!\right )^3+\left (2!\right )^3+\left (3!\right )^3+\cdots+\left (999!\right )^3
Determine the units digit of the sum of the above expression.
Source: mathcontest.olemiss.edu 3/26/2012

SOLUTION
This problem is related to the problem titled “Factorials Cubed” dated 3/27/2012.

Answer: 9

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About mvtrinh

Retired high school math teacher.
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