यदि (n(A)=30), (n(B)=28) और (n\(A\cup B\)=52) है, तो (n(A-B)) कितना है?
If (n(A)=30), (n(B)=28) and (n\(A\cup B\)=52), then what is (n(A-B))?
Explanation opens after your attempt
A. (24)
Concept
First (n\(A\cap B\)=30+28-52=6), then (A-B=30-6=24). Identify the common part before finding difference.
Why this answer is correct
The correct answer is A. (24). First (n\(A\cap B\)=30+28-52=6), then (A-B=30-6=24). Identify the common part before finding difference.
Exam Tip
पहले (n\(A\cap B\)=30+28-52=6), फिर (A-B=30-6=24) है। अंतर निकालने से पहले साझा भाग पहचानें।
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