there are 6 red shoes & 4 green shoes . if two of red shoes are drawn what is the probability of getting red shoes
"taking 2 red shoe the probablity is 6 c 2 from 10 shoes probablity of taking 2 red shoe is 6 c 2 / 10 c 2 = 1 / 3 answer : a"
divide(choose(6, const_2), choose(add(6, 4), const_2))