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April 16th, 2007, 03:24 PM   #1
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Band or Sports

In a school of 320 students, 85 students are in the band, 200 students are on sports teams, and 60 students participate in both activities. How many students are involved in either band or sports?
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April 16th, 2007, 04:20 PM   #2
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By the principal of inclusion-exclusion, AuB=A+B-AnB. In other words, the number of students who are involved in one or the other is equal to the number of students in band plus the number of students in sports minus the number of students in both. See if you can solve it from here.
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