यदि (n\(A\cup B\)=75), (n(A-B)=28) और (n(B-A)=31), तो (n\(A\cap B\)) क्या है?
If (n\(A\cup B\)=75), (n(A-B)=28), and (n(B-A)=31), what is (n\(A\cap B\))?
Explanation opens after your attempt
A. (16)
Concept
The union is made of disjoint parts (A-B), (B-A), and \(A\cap B\). So (75=28+31+x), hence (x=16).
Why this answer is correct
The correct answer is A. (16). The union is made of disjoint parts (A-B), (B-A), and \(A\cap B\). So (75=28+31+x), hence (x=16).
Exam Tip
संघ (A-B), (B-A) और \(A\cap B\) के असंबद्ध भागों से बनता है। इसलिए (75=28+31+x), अतः (x=16)।
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