Discussion
In a group of students, 100 students know Hindi, 50 know English and 25 know both. Each of the students knows either Hindi or English. How many students are there in the group?
Answer: B
Let H be the set of students who know Hindi and E be the set of students who know English.
n(H) = 100, n(E) = 50, n(H ∩ E) = 25.
Since each student knows at least one language, the total number of students is the union of the two sets, n(H ∪ E).
n(H ∪ E) = n(H) + n(E) - n(H ∩ E) = 100 + 50 - 25 = 125.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development