यदि (n(A)=9), (n(B)=7), (n\(A\cap B\)=2), तो केवल (A) और केवल (B) की कुल संख्या क्या है?
If (n(A)=9), (n(B)=7), and (n\(A\cap B\)=2), what is the total number of elements only in (A) and only in (B)?
Explanation opens after your attempt
B. (12)
Concept
Only (A=9-2=7) and only (B=7-2=5), so the total is (12). Add only after separating the common part.
Why this answer is correct
The correct answer is B. (12). Only (A=9-2=7) and only (B=7-2=5), so the total is (12). Add only after separating the common part.
Exam Tip
केवल (A=9-2=7) और केवल (B=7-2=5), इसलिए कुल (12) है। साझा भाग अलग करने के बाद ही जोड़ें।
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