Quant

unit digit of 723^723  *  824^824   *  529 ^529 ?????????????

 

sol>

723^723=723^720 * 723^3 term will gve last digit .........7 ......... (1*7)
824^824=824^820 * 824^4 term will gve last digit........6.............(4*4)
529 ^529=529 ^520 * 529 ^9 term will gve last digit.......9...............(1*9)

then
7*6*9=unit digit 8