Question

In a hostel there are 125 students out of which 80drink tea 60drink coffees d 20 drink tea and coffe both find the number of students who do not drink tea or coffee

Answer 1

Answer:

Let A be the set of students who drink tea and B the set of students who drink coffee.

we have ,

n(U)=125, n(A)=80,n(B)=60 and n(A n B)=20

since,

n(A U B)=n(A)+n(B)-n(A n B)

=80+60-20

n(A U B)=120

So,the number of students who do not drink tea or coffee=125-120=5

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