यदि \(A\subseteq B\), (n(A)=32), (n(B)=57) और (n(U)=90) है, तो (n(B-A)) कितना होगा?
If \(A\subseteq B\), (n(A)=32), (n(B)=57) and (n(U)=90), then what is (n(B-A))?
Explanation opens after your attempt
Correct Answer
A. (25)
Concept
Since \(A\subseteq B\), (B-A) has (57-32=25) elements. In subset diagrams, the smaller circle lies inside the larger one.
Why this answer is correct
The correct answer is A. (25). Since \(A\subseteq B\), (B-A) has (57-32=25) elements. In subset diagrams, the smaller circle lies inside the larger one.
Exam Tip
क्योंकि \(A\subseteq B\), इसलिए (B-A) में (57-32=25) तत्व होंगे। उपसमुच्चय वाले आरेख में छोटा वृत्त बड़े के भीतर होता है।
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