if k ^ 3 is divisible by 84 , what is the least possible value of integer k ?
"k ^ 3 = 84 * x = 2 ^ 2 * 3 * 7 * x the factors of k must at minimum include 2 * 3 * 7 = 42 . the answer is b ."
divide(divide(84, const_2), const_2)