Posted by John on .
Find the remainder when 1!+2!+...+299!+300! is divided by 21

math 
Count Iblis,
Hint:
n! Mod 21 = 0 if n >= 7
Posted by John on .
Find the remainder when 1!+2!+...+299!+300! is divided by 21
Hint:
n! Mod 21 = 0 if n >= 7