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Mathematics 21 Online
OpenStudy (anonymous):

A poll was taken of 165 regular movie-goers: 51 had seen District 9 51 had seen Funny People 69 had seen The Final Destination 18 had seen District 9 and Funny People 24 had seen District 9 and The Final Destination 30 had seen Funny People and The Final Destination 6 had seen all three movies How many people had seen exactly two movies?

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