यदि (n(A)=21), केवल (A) (13), और (n(B-A)=10), तो (n\(A\cup B\)) क्या है?
If (n(A)=21), only (A) is (13), and (n(B-A)=10), what is (n\(A\cup B\))?
Explanation opens after your attempt
B. (31)
Concept
First the common part is (21-13=8). Then (n\(A\cup B\)=13+8+10=31).
Why this answer is correct
The correct answer is B. (31). First the common part is (21-13=8). Then (n\(A\cup B\)=13+8+10=31).
Exam Tip
पहले साझा भाग (21-13=8) है। फिर (n\(A\cup B\)=13+8+10=31)।
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