यदि (n(A)=54), (n(B)=61) और ठीक एक समुच्चय में (73) तत्व हैं, तो (n\(A\cap B\)) कितना होगा?
If (n(A)=54), (n(B)=61), and (73) elements are in exactly one set, what is (n\(A\cap B\))?
Explanation opens after your attempt
C. (21)
Concept
Exactly one is (n(A)+n(B)-2n\(A\cap B\)). So (73=115-2x), giving (x=21).
Why this answer is correct
The correct answer is C. (21). Exactly one is (n(A)+n(B)-2n\(A\cap B\)). So (73=115-2x), giving (x=21).
Exam Tip
ठीक एक (n(A)+n(B)-2n\(A\cap B\)) होता है। इसलिए (73=115-2x), तो (x=21)।
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