Question

In a hostel there are 125 students ,out of which 80 drinks tea, 60 drink coffee and 20 drink tea and coffee both. find ​

Answer 1

Answer:

let tea be A

let coffee be B

then

n(AUB) = n(A)+n(B)-n(A^B)

= 80+60-20

= 120

so 120 students drink both tea or coffee or both

and 5 students drink neither tea or cofee