In a survey of 550 students in a school, it was found that 175 students drink milk, 300 students drink tea and 110 students drink both milk and tea. Find the number of students who drinks neither milk nor tea.
Solution:
Let, the set of students drink milk be M
The set of students drink tea be T
Given,
n(T)= 300
n(MꓵT)= 110
We know that,
n(MUT)= n(M) + n(T) - n(MꓵT)
= 175 + 300 – 110
= 365
Therefore, the number of students who drink neither milk nor tea
= 550 – 365
= 185
Exercise: 1.1