what is the remainder when 15487 ^ ( 62177037 ) is divided by 5 ?
"we need to find the units digit of the number . the units digit of powers of seven repeats 7 , 9 , 3 , and 1 cyclically . since 62177037 has the form 4 a + 1 , the units digit is 7 . then the remainder when dividing by 5 is 2 . the answer is c ."
reminder(multiply(62177037, 15487), 5)