Question

In a hostel there are 100 boys. Out of these, 60 boys drink tea. 50 boys drink coffee. And 30

boys drink both tea and coffee. Find the number of the boys who do not drink both either tea or coffee.​

Answer 1

Step-by-step explanation:

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