Question 445967: Robert has 11 red folders, 5 blue folders, 13 green folders, and 9 black folders on his shelf.
If he randomly grabs a folder, what is the probability that it will be either green or black?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Robert has 11 red folders, 5 blue folders, 13 green folders, and 9 black folders on his shelf.
If he randomly grabs a folder, what is the probability that it will be either green or black?
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P(green or black) = (13+9)/38 = 22/38 = 11/19
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Cheers,
Stan H.
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