Total drink
=3 (i.e., milk, coffee, tea).
10 students take all 3 drinks
i.e.
n(M∩C∩T)=10
Only 20 students take milk and coffee
i.e.,
n(M∪C)=20 and 30 students take coffee and tea
i.e.,
n(C∪T)=30 and 25 students take milk and tea
i.e.,
n(M∪T)=25 12 students take milk only
i.e.,
n(M)=12 5 students take coffee only
i.e.,
n(C)=5 and 8 students take tea only
i.e.,
n(T)=8 Total number of students who take any of the drink is 80 .
∴ The number of students who did not take any of three drinks
=100−80=20