Mathematics, 05.05.2020 08:13 weirdojuwin
A drawer contains 10 blue pens, 10 black pens, and 10 red pens. Without looking. Mr. Lopez is going to take one pen from the drawer, use it, and then put it back into the drawer. Then he is going to take another pen from the drawer to use. What is the probability of Mr. Lopez taking a red pen first and then taking a blue pen?
Answers: 3
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A drawer contains 10 blue pens, 10 black pens, and 10 red pens. Without looking. Mr. Lopez is going...
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