Question
what is the unit digit in (7^95 - 3^58) ?
Answers
Steve
powers of 7 end in 7,9,3,1,...
so, 7^95 = 7^92 * 7^3 -- it ends in 3
do a similar thing for powers of 3.
then do the subtraction.
so, 7^95 = 7^92 * 7^3 -- it ends in 3
do a similar thing for powers of 3.
then do the subtraction.