तीन समुच्चयों के लिए (n(A)=40), (n(B)=38), (n(C)=35), (n\(A\cap B\)=14), (n\(B\cap C\)=12), (n\(C\cap A\)=10), (n\(A\cap B\cap C\)=5) है। (n\(A\cup B\cup C\)) कितना है?
For three sets, (n(A)=40), (n(B)=38), (n(C)=35), (n\(A\cap B\)=14), (n\(B\cap C\)=12), (n\(C\cap A\)=10), and (n\(A\cap B\cap C\)=5). What is (n\(A\cup B\cup C\))?
Explanation opens after your attempt
A. (82)
Concept
The three-set formula gives (40+38+35-14-12-10+5=82). The common part of all three must be added back at the end.
Why this answer is correct
The correct answer is A. (82). The three-set formula gives (40+38+35-14-12-10+5=82). The common part of all three must be added back at the end.
Exam Tip
तीन समुच्चयों का सूत्र (40+38+35-14-12-10+5=82) देता है। तीनों के साझा भाग को अंत में फिर जोड़ना जरूरी है।
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