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SMO 2005 Senior Round 1 Question 4

SMO · SMO 2005 Senior Round 1

Question 4

What is the sum of the last two digits of the integer $1!+2!+3!+\cdots+2005!$?
  1. $3$
  2. $4$
  3. $5$
  4. $6$
  5. $7$