यदि (n(B-A)=21) और (n\(A\cap B\)=13), तो (n(B)) क्या है?
If (n(B-A)=21) and (n\(A\cap B\)=13), what is (n(B))?
Explanation opens after your attempt
C. (34)
Concept
Set (B) contains both only (B) and the common part. Therefore, (n(B)=21+13=34).
Why this answer is correct
The correct answer is C. (34). Set (B) contains both only (B) and the common part. Therefore, (n(B)=21+13=34).
Exam Tip
(B) में केवल (B) और साझा भाग दोनों होते हैं। इसलिए (n(B)=21+13=34)।
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