Question

$Findtheunitdigitof{123}^{456}Ans.$______________.

Answer 1

Unit digit of ${123}^{4n+1}$ = 3, Unit digit of ${123}^{4n+2}$ = 9, Unit digit of ${123}^{4n+3}$= 7, Unit digit of ${123}^{4n}$ = 1. Unit digit of${123}^{456}$ = 1.