यदि \(A\cap B=\varnothing\), (n(A)=41), (n(B)=39) और (n(U)=100) है, तो (n(\(A\cup B\)')) कितना है?
If \(A\cap B=\varnothing\), (n(A)=41), (n(B)=39) and (n(U)=100), then what is (n(\(A\cup B\)'))?
Explanation opens after your attempt
A. (20)
Concept
For disjoint sets, (n\(A\cup B\)=41+39=80), so the complement is (20). When sets are disjoint, take the intersection as zero.
Why this answer is correct
The correct answer is A. (20). For disjoint sets, (n\(A\cup B\)=41+39=80), so the complement is (20). When sets are disjoint, take the intersection as zero.
Exam Tip
असंबद्ध समुच्चयों में (n\(A\cup B\)=41+39=80), इसलिए पूरक (20) है। असंबद्ध होने पर प्रतिच्छेद शून्य मानें।
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