

InterviewSolution
Saved Bookmarks
1. |
In a group of students, 100students know Hindi, 50 know English and 25 know both. Each of the studentsknows either Hindi or English. How many students are there in the group? |
Answer» Let H be the set of people who know Hindi and E be the set of people who know English Then `(H cap E)` will represent the set of people who know Hindi and English both Here `n(H) = 100,n(E) =50 and n(H cap E) = 25` Now `n(H cup E) = n(H) +(E)- n(H cap E) =25` `rArr n(H cup E)=100+50 -25` `rArr n (H cup E)=125` Therefore, total number of students in the group = 125. |
|