what is the remainder when 54487 ^ ( 42787035 ) 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 42787035 has the form 4 a + 3 , the units digit is 3 . then the remainder when dividing by 5 is 3 . the answer is d ."
reminder(multiply(42787035, 54487), 5)