यदि (n(A-B)=13) और (n\(A\cap B\)=7), तो (n(A)) क्या है?
If (n(A-B)=13) and (n\(A\cap B\)=7), what is (n(A))?
Explanation opens after your attempt
B. (20)
Concept
(A) is made of two disjoint parts (A-B) and \(A\cap B\). Hence (n(A)=13+7=20).
Why this answer is correct
The correct answer is B. (20). (A) is made of two disjoint parts (A-B) and \(A\cap B\). Hence (n(A)=13+7=20).
Exam Tip
(A) दो अलग भागों (A-B) और \(A\cap B\) से बनता है। इसलिए (n(A)=13+7=20)।
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