Don has 4 black pens, 3 blue pens, and 2 red pens in his school bag. Don randomly picks two pens out of his school bag. 1. What is the probability that Don chose two blue pens, if he replaced the first pen back in his school bag before choosing a second pen? 2. What is the probability that Don chose black pens and red, if he replaced the first pen back in his school bag before choosing a second pen?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Don has 4 black pens, 3 blue pens, and 2 red pens in his school bag. Don
randomly picks two pens out of his school bag.
1. What is the probability that Don chose two blue pens, if he replaced the
first pen back in his school bag before choosing a second pen?
2. What is the probability that Don chose black pens and red, if he replaced
the first pen back in his school bag before choosing a second pen?
Transcribed Image Text:Don has 4 black pens, 3 blue pens, and 2 red pens in his school bag. Don randomly picks two pens out of his school bag. 1. What is the probability that Don chose two blue pens, if he replaced the first pen back in his school bag before choosing a second pen? 2. What is the probability that Don chose black pens and red, if he replaced the first pen back in his school bag before choosing a second pen?
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