A bag contains 10 red marbles, 5 gray marbles, 12 black marbles, and 8 white marbles. Two marbles are randomly drawn from the bag without replacement. What is the probability of drawing a black marble followed by a red marble?

Question

4098 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-05-11T13:24:23

#12/119#

p[black]=#12/35# as there are 10 black marbles and 35 marbles in total.

p[red]=#10/34# as there are 10 red marbles but only 34 in total as a black one has come out.

#P(B nn R)=12/35 xx10/34=120/1190=12/119#