what is ( 21 ^ 7 + 21 ) / 21 ?
( 21 ^ 7 + 21 ) / 21 = 21 * ( 21 ^ 6 + 1 ) / 21 = 21 ^ 6 + 1 clearly this is a number which ends with a 2 in the units place . the answer is d .
divide(add(power(21, 7), 21), 21)