In a school hostel, there are 100 students 60 of them drink milk,50 drink cocoa and 30 drink both milk and cocoa . Find the number of students who take at least one of the 2 drink. Also find the number of students who do not take milk or cocoa
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Since , n(A∪B)=n(A)+n(B)−n(A∩B)
Number of students who take tea or coffee =60+50−30=80
So, number of students who do not take tea or coffee =100=80=20
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