there are 14 slate rocks , 20 pumice rocks , and 10 granite rocks randomly distributed in a certain field . if 2 rocks are chosen at random and without replacement , what is the probability that both rocks will be slate rocks ?
"14 / 44 * 13 / 43 = 91 / 946 the answer is d ."
multiply(divide(14, add(add(14, 20), 10)), divide(subtract(14, const_1), subtract(add(add(14, 20), 10), const_1)))