यदि (n\(A\cap B\)=20), (n\(B\cap C\)=18), (n\(C\cap A\)=16) और (n\(A\cap B\cap C\)=6) है, तो ठीक दो समुच्चयों में कितने तत्व हैं?
If (n\(A\cap B\)=20), (n\(B\cap C\)=18), (n\(C\cap A\)=16), and (n\(A\cap B\cap C\)=6), how many elements are in exactly two sets?
Explanation opens after your attempt
A. (36)
Concept
Exactly two is \(20+18+16-3\cdot6=36\). The triple part is counted repeatedly in pairwise intersections.
Why this answer is correct
The correct answer is A. (36). Exactly two is \(20+18+16-3\cdot6=36\). The triple part is counted repeatedly in pairwise intersections.
Exam Tip
ठीक दो \(=20+18+16-3\cdot6=36\)। युग्म छेदनों में त्रिक भाग बार-बार गिना जाता है।
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