SASMO 2017 Secondary 4 (Grade 10) Contest Question 8

ees It is given that n! = nx (n—1) x (n—- 2) x...x 3.x 2x 1. For example, 4! =
4X 3x2 1, Find the remainder when 1! + 2! +3! +--+ 10! is divided by 9.

See] A. 0