यदि (n(A)=28), (n(B)=30), और केवल (B) में (21) अवयव हैं, तो (n\(A\cap B\)) क्या है?
If (n(A)=28), (n(B)=30), and only (B) has (21) elements, what is (n\(A\cap B\))?
Explanation opens after your attempt
B. (9)
Concept
Out of total (30) elements of (B), only (B) has (21). Therefore, the common part is (30-21=9).
Why this answer is correct
The correct answer is B. (9). Out of total (30) elements of (B), only (B) has (21). Therefore, the common part is (30-21=9).
Exam Tip
(B) के कुल (30) में केवल (B) (21) है। इसलिए साझा भाग (30-21=9) है।
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