तीन समुच्चयों में (n(A)=42), (n(B)=39), (n(C)=35), (n\(A\cap B\)=15), (n\(B\cap C\)=13), (n\(C\cap A\)=11) और (n\(A\cap B\cap C\)=5) है। (n\(A\cup B\cup C\)) कितना है?
For three sets, (n(A)=42), (n(B)=39), (n(C)=35), (n\(A\cap B\)=15), (n\(B\cap C\)=13), (n\(C\cap A\)=11), and (n\(A\cap B\cap C\)=5). What is (n\(A\cup B\cup C\))?
Explanation opens after your attempt
B. (87)
Concept
The union of three sets is (42+39+35-15-13-11+5=87). Adding back the final common part is necessary.
Why this answer is correct
The correct answer is B. (87). The union of three sets is (42+39+35-15-13-11+5=87). Adding back the final common part is necessary.
Exam Tip
तीन समुच्चयों का संघ (42+39+35-15-13-11+5=87) है। अंतिम साझा भाग को वापस जोड़ना जरूरी है।
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