the units digit of ( 35 ) ^ ( 87 ) + ( 93 ) ^ ( 47 ) is :
"the units digit of powers of 3 , cycles in a group of 4 : { 3 , 9 , 7 , 1 } 47 has the form 4 k + 3 , so the units digit of 93 ^ 47 is 7 . the units digit if powers of 5 is always 5 . 7 + 5 = 12 , so the units digit is 2 . the answer is a ."
add(reminder(multiply(reminder(47, const_4), 93), const_10), reminder(35, const_10))