L and A are classmates as well as good friends. In a class of 30 students, L has 10 unique friends and 5 friends who are common to A. A has a total of 17 friends in the class. How many students are friends with neither L nor A?

Correct option is B

Solution:

The given information can be represented by a Venn diagram as follows:

Total students in class = 30

Total friends of L and A = 10 + 5 + 12  = 27

Number of students who are friends with neither L nor A = 30 - 27 = 3