find unit digit of [m]1!^1 + 2!^2 + 3!^3 + 4!^4 + 5!^5 + 6!^

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find unit digit of [m]1!^1 + 2!^2 + 3!^3 + 4!^4 + 5!^5 + 6!^6 + 7!^7 + 8!^8 + 9!^9 + 10!^{10}[/m]

A) 1
B) 3
C) 5
D) 7
E) 9

Source: www.GMATinsight.com

Answer: Option D
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