यदि \(A\cap B=\varnothing\), (n(A)=21) और (n(B)=17) है, तो (n\(A\cup B\)) कितना होगा?
If \(A\cap B=\varnothing\), (n(A)=21), and (n(B)=17), then what is (n\(A\cup B\))?
Explanation opens after your attempt
A. (38)
Concept
Disjoint sets have no common element. Therefore (n\(A\cup B\)=21+17=38).
Why this answer is correct
The correct answer is A. (38). Disjoint sets have no common element. Therefore (n\(A\cup B\)=21+17=38).
Exam Tip
असंबद्ध समुच्चयों में कोई साझा तत्व नहीं होता। इसलिए (n\(A\cup B\)=21+17=38)।
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