यदि (A-B={p,q}), \(A\cap B={r,s,t}\) और (B-A={u}), तो (n(A)) कितना है?
If (A-B={p,q}), \(A\cap B={r,s,t}\), and (B-A={u}), what is (n(A))?
Explanation opens after your attempt
Correct Answer
A. (,5,)
Concept
Set (A) contains the elements of (A-B) and \(A\cap B\). Hence (n(A)=2+3=5).
Why this answer is correct
The correct answer is A. (,5,). Set (A) contains the elements of (A-B) and \(A\cap B\). Hence (n(A)=2+3=5).
Exam Tip
समुच्चय (A) में (A-B) और \(A\cap B\) के तत्व आते हैं। इसलिए (n(A)=2+3=5)।
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