there are 4 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 probability is 4 c 2 from 8 shoes probability of taking 2 red shoes is 4 c 2 / 8 c 2 = 3 / 14 answer : c"
divide(choose(4, const_2), choose(add(4, 4), const_2))