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IKMC 2018 - Grades 11-12 - Self-study Question 30

IKMC · IKMC 2018 - Grades 11-12 - Self-study

Question 30

Archimedes calculated $15!$ and wrote the result on the board. The second and tenth digits cannot be read. What are the missing digits? Here $15!=15\cdot14\cdot13\cdots2\cdot1$.

Question illustration
  1. 2 and 0
  2. 4 and 8
  3. 7 and 4
  4. 9 and 2
  5. 3 and 8