Question

How many qualified in both Maths and LR but not any other subjects?

• A. 5
• B. 10
• C. 15
• D. 20

Hint:

For “\(A\) and \(B\) but not others,” subtract the triple intersections that include \(A\) and \(B\) from \(|A\cap B|\).

Answer 1

The Correct Option is B

Exactly \(M\cap L\) only (excluding \(D\) and \(E\)) equals \[ |M\cap L| - |M\cap L\cap E| - |D\cap M\cap L| = 20-5-5=10. \] \[ \boxed{10} \]