Mathematics, 18.03.2021 17:00 WarriorWolf3773
A box contains 10 blue pens and 10 red pens. Without looking, mrs. Perez selects a pen, uses it, and returns it to the box. Then go back and get another pen to use. What is the probability that Mrs. Perez chooses a red pen first and then a blue pen?
Answers: 3
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A box contains 10 blue pens and 10 red pens. Without looking, mrs. Perez selects a pen, uses it, and...
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