How many flags contain exactly two of the three colors? The three most common colors in the

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How many flags contain exactly two of the three colors?
The three most common colors in the 193 flags of the member nations of the United Nations are red, white, and blue:
52 flags contain all three colors
103 flags contain both red and white
66 flags contain both red and blue
73 flags contain both white and blue
145 flags contain red
132 flags contain white
104 flags contain blue.
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Finite Mathematics and Its Applications

ISBN: 978-0134768632

12th edition

Authors: Larry J. Goldstein, David I. Schneider, Martha J. Siegel, Steven Hair

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