A toothpaste firm claims that a survey of 65 people revealed the following results:                 9 use Happy and Close Up                 11 use Happy and Colgate                 8 use Colgate and Close Up                 21 use Happy only                 15 use Close Up only                 11 use only Colgate only      How many uses the 3 brands? a. 7 b. 5 c. 8 d. 6

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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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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A toothpaste firm claims that a survey of 65 people revealed the following results:

                9 use Happy and Close Up

                11 use Happy and Colgate

                8 use Colgate and Close Up

                21 use Happy only

                15 use Close Up only

                11 use only Colgate only

     How many uses the 3 brands?

a. 7
b. 5
c. 8
d. 6
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