probability?

A bag contains 5 red marbles, 7 blue marbles, and 10 green marbles. One marble is drawn at random. What is the probability that it will be either:a. red or green?b. blue or green?c. red or blue?

a. 15/22b. 17/22c. 12/22

(a) 15/22(b) 17/22(c) 12/22

a) p(r U g) = p(r) + p(g) - p(r ^ g) p(r) = (5/22)*(4/21) p(g) = (10/22) p(r ^ g) = (5/22)*(10/21)*2proceed others same like this