यदि (n(A)=18) और (n\(A\cap B\)=7) है, तो (n(A-B)) कितना होगा?
If (n(A)=18) and (n\(A\cap B\)=7), what is (n(A-B))?
Explanation opens after your attempt
C. (11)
Concept
In (A-B), the (7) common elements are removed from (A), so (18-7=11). Count only elements related to (A).
Why this answer is correct
The correct answer is C. (11). In (A-B), the (7) common elements are removed from (A), so (18-7=11). Count only elements related to (A).
Exam Tip
(A-B) में (A) से सामान्य (7) अवयव हटेंगे, इसलिए (18-7=11) है। केवल (A) से जुड़े अवयव गिनें।
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