Calculate the last 2 digits of the sum : S=1!+2!+3!+...+2015! (n!=1*2*3*...*n) (?)
1 Answer
Jun 17, 2017
Explanation:
#1!+2!+3!+4!+5!+6!+7!+8!+9!#
#=1+2+6+24+120+720+5040+40320+362880#
#=409113#
Any larger factorial will have