what is the probability of getting exactly 4 heads in a single throw of five fair coins ?
"one possible case is hhhht . p ( hhhht ) = 1 / 2 * 1 / 2 * 1 / 2 * 1 / 2 * 1 / 2 = 1 / 32 there are 5 c 4 = 5 possible cases . p ( 4 heads ) = 5 * 1 / 32 = 5 / 32 the answer is d ."
divide(const_2, choose(add(const_3, const_3), const_3))