Question

A box contains 20 red marbles and 30 blue marbles. A second box contains 10 white marbles and 40 black marbles. If you choose one marble from each box without looking, what is the probability that you get a blue marble and a black marble?

(a). 2/25
(b). 12/25
(c). 23/25

Answer 1

so then you mult. the 2 possiblities
for the first box the probability to get a blue marble is 30/50
for the second box the probability to get a black marble is 40/50
so then you do 30/50 X 40/50 and simplify to get 12/25 :)