यदि (n(A)=63), (n\(A\cap B\)=26), (n\(A\cap C\)=24) और (n\(A\cap B\cap C\)=9) है, तो केवल (A) कितने हैं?
If (n(A)=63), (n\(A\cap B\)=26), (n\(A\cap C\)=24), and (n\(A\cap B\cap C\)=9), how many are only in (A)?
Explanation opens after your attempt
B. (22)
Concept
Only (A=63-26-24+9=22). The central part is subtracted twice, so it is added once.
Why this answer is correct
The correct answer is B. (22). Only (A=63-26-24+9=22). The central part is subtracted twice, so it is added once.
Exam Tip
केवल (A=63-26-24+9=22) है। केंद्रीय भाग दो बार घटता है, इसलिए एक बार जोड़ा जाता है।
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