A bag has 4 green marbles, 3 marbles, and 3 yellow marbles. What is the probability that you pick a red marble, do not replace it, and pick a yellow marble?

1 Answer
Mark D.
Apr 29, 2018

#1/10#

Explanation:

Assuming there are 3 red marbles

#3/10 xx3/9=9/90=1/10#

There are 3 red, that is where the first numerator comes from and there are 10 marbles so that is where the denominator comes from. There are 3 yellows, hence the second numerator but as we have taken a marble out there are now only 9 marbles in total.

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