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1968 AMC 12 Question 21

AMC12 · 1968 AMC 12

Question 21

If $S=1!+2!+3!+\cdots+99!,$ then the units digit in the value of $S$ is:
  1. $9$
  2. $8$
  3. $5$
  4. $3$
  5. $0$