यदि (n(A)=36), (n(B)=28), और (n\(A\cap B\)=12), तो (n\(A\cup B\)) क्या है?
If (n(A)=36), (n(B)=28), and (n\(A\cap B\)=12), what is (n\(A\cup B\))?
Explanation opens after your attempt
A. (52)
Concept
Using (n\(A\cup B\)=n(A)+n(B)-n\(A\cap B\)), we get (36+28-12=52). Subtract the common part once.
Why this answer is correct
The correct answer is A. (52). Using (n\(A\cup B\)=n(A)+n(B)-n\(A\cap B\)), we get (36+28-12=52). Subtract the common part once.
Exam Tip
सूत्र (n\(A\cup B\)=n(A)+n(B)-n\(A\cap B\)) से (36+28-12=52) मिलता है। साझा भाग को एक बार घटाएं।
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