यदि (n(B)=15) और (n\(A\cap B\)=6) है, तो (n(B-A)) कितना है?
If (n(B)=15) and (n\(A\cap B\)=6), what is (n(B-A))?
Explanation opens after your attempt
A. (9)
Concept
For (B-A), the common part is removed from (B), so (15-6=9). In difference, subtract from the first set.
Why this answer is correct
The correct answer is A. (9). For (B-A), the common part is removed from (B), so (15-6=9). In difference, subtract from the first set.
Exam Tip
(B-A) के लिए (B) से सामान्य भाग हटेगा, इसलिए (15-6=9) है। अंतर में पहले समुच्चय की संख्या से घटाएं।
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