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OpenStudy (anonymous):
Marty has exactly 5 blue pens, 6 black pens, and 4 red pens in his knapsack. If he pulls out one pen at random from his knapsack, what is the probability that the pen is either red or black?
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OpenStudy (dan815):
hello
OpenStudy (dan815):
how many red or black pens are there?
OpenStudy (dan815):
how many total numbers of pens are there?
OpenStudy (dan815):
so what would hte probability of picking red or black pens out of the total pens be
OpenStudy (anonymous):
Probability of something is always, (value of something)/(value of total possibilities)
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