April 16th, 2007, 03:24 PM  #1 
Senior Member Joined: Dec 2006 From: New Jersey Posts: 378 Thanks: 1  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?

April 16th, 2007, 04:20 PM  #2 
Senior Member Joined: Nov 2006 From: I'm a figment of my own imagination :? Posts: 848 Thanks: 0 
By the principal of inclusionexclusion, AuB=A+BAnB. 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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