math
posted by Melissa on .
An urn contains 5 red marbles, 4 blue marbles, and 3 green marbles. A marble is selected at random and then, without replacing the first marble, a second marble is selected at random. What is the probability of selecting a green marble and then a red marble?

Green = 3/12
Red = 5/11, because one green marble has already been picked.
The probability of both/all events occurring if found by multiplying the probabilities of the individual events. 
15/132

Solve this problem.
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