AHSME 1968 Problem 21

If $S=1!+2!+3!+\cdots +99!$ , then the units' digit in the value of S is: $\text{(A) } 9 \text{(B) } 8 \text{(C) } 5 \text{(D) } 3 \text{(E) } 0$

Dataset text NuminaMath-1.5. Quoted with source.

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