Skip to content / Đến nội dung
ThichHocToan.com

IKMC 2009 - Grades 11-12 - Paper 01 - Self-study Question 22

IKMC · IKMC 2009 - Grades 11-12 - Paper 01 - Self-study

Question 22

Let $Z$ be the number of eight-digit numbers with eight distinct nonzero digits. How many of them are divisible by 9?
  1. $Z/8$
  2. $Z/3$
  3. $Z/9$
  4. $8Z/9$
  5. $7Z/8$