Q37: A jar contains 16 marbles, of which 4 are red, 3 are blue, and the rest are yellow. If 2 marbles are to be selected at random from the jar, one at a time without being replaced, what is the probability that the first marble selected will be red and the second marble selected will be blue? A. 3/64 B. 1/20 C. 1/16 D. 1/12 E. 1/8

唉 已经忘了这种基本的概率题

请教一下做法 谢谢!!

B is right?

(c4 1 * c3 1/)(c16 1 * c15 1)