यदि (n\(A\cup B\)=60), (n(A-B)=18) और (n(B-A)=22), तो (n\(A\cap B\)) क्या है?
If (n\(A\cup B\)=60), (n(A-B)=18), and (n(B-A)=22), what is (n\(A\cap B\))?
Explanation opens after your attempt
A. (20)
Concept
\(A\cup B\) is made of three disjoint parts (A-B), (B-A), and \(A\cap B\). Thus (n\(A\cap B\)=60-18-22=20).
Why this answer is correct
The correct answer is A. (20). \(A\cup B\) is made of three disjoint parts (A-B), (B-A), and \(A\cap B\). Thus (n\(A\cap B\)=60-18-22=20).
Exam Tip
\(A\cup B\) तीन अलग भागों (A-B), (B-A) और \(A\cap B\) से बनता है। इसलिए (n\(A\cap B\)=60-18-22=20)।
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