यदि (n(A)=20), (n(B)=15), और (n\(A\cup B\)=28), तो (n\(A\cap B\)) क्या है?
If (n(A)=20), (n(B)=15), and (n\(A\cup B\)=28), what is (n\(A\cap B\))?
Explanation opens after your attempt
B. (7)
Concept
(n\(A\cap B\)=20+15-28=7). To find intersection of two sets, subtract the union from the sum.
Why this answer is correct
The correct answer is B. (7). (n\(A\cap B\)=20+15-28=7). To find intersection of two sets, subtract the union from the sum.
Exam Tip
(n\(A\cap B\)=20+15-28=7) होगा। दो समुच्चयों में प्रतिच्छेद निकालने के लिए संघ को घटाएं।
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