यदि (n(A)=72), (n(B)=68) और ठीक एक समुच्चय में (82) तत्व हैं, तो (n\(A\cap B\)) कितना है?
If (n(A)=72), (n(B)=68), and exactly one set has (82) elements, what is (n\(A\cap B\))?
Explanation opens after your attempt
A. (29)
Concept
Exactly one equals (n(A)+n(B)-2n\(A\cap B\)), so (82=140-2x) and (x=29). The common part is removed twice for exactly one.
Why this answer is correct
The correct answer is A. (29). Exactly one equals (n(A)+n(B)-2n\(A\cap B\)), so (82=140-2x) and (x=29). The common part is removed twice for exactly one.
Exam Tip
ठीक एक (=n(A)+n(B)-2n\(A\cap B\)), इसलिए (82=140-2x) और (x=29)। ठीक एक में साझा भाग दो बार घटता है।
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