In a party, there are 10people with white shirts and 8 people with red shirts; 4 people have black shoes and white shirts; 3 people have black shoes and red shirts; The total number of people with white or red shirts or black shoes is 21. How many people have black shoes?

Computer Networking: A Top-Down Approach (7th Edition)
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ISBN:9780133594140
Author:James Kurose, Keith Ross
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In a party, there are 10people with white shirts and 8 people with red shirts;

4 people have black shoes and white shirts;

3 people have black shoes and red shirts;

The total number of people with white or red shirts or black shoes is 21.

How many people have black shoes? 

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