यदि (n(A)=86), (n(B)=79), (n(C)=71), (n\(A\cap B\)=34), (n\(B\cap C\)=29), (n\(C\cap A\)=27) और (n\(A\cap B\cap C\)=12) है, तो केवल (C) में कितने तत्व हैं?
If (n(A)=86), (n(B)=79), (n(C)=71), (n\(A\cap B\)=34), (n\(B\cap C\)=29), (n\(C\cap A\)=27) and (n\(A\cap B\cap C\)=12), then how many elements are only in (C)?
Explanation opens after your attempt
A. (27)
Concept
Only (C=71-29-27+12=27). When two common parts are subtracted, the centre is removed twice, so add it back.
Why this answer is correct
The correct answer is A. (27). Only (C=71-29-27+12=27). When two common parts are subtracted, the centre is removed twice, so add it back.
Exam Tip
केवल (C=71-29-27+12=27) है। दो साझा भाग घटाने पर केंद्र दो बार घटता है, इसलिए उसे जोड़ें।
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