यदि (n(U)=100), (n(A)=45), (n(B)=40), और (n\(A\cap B\)=15), तो (n(\(A\cup B\)')) क्या है?
If (n(U)=100), (n(A)=45), (n(B)=40), and (n\(A\cap B\)=15), what is (n(\(A\cup B\)'))?
Explanation opens after your attempt
A. (30)
Concept
First, (n\(A\cup B\)=45+40-15=70). Therefore, (n(\(A\cup B\)')=100-70=30).
Why this answer is correct
The correct answer is A. (30). First, (n\(A\cup B\)=45+40-15=70). Therefore, (n(\(A\cup B\)')=100-70=30).
Exam Tip
पहले (n\(A\cup B\)=45+40-15=70)। इसलिए (n(\(A\cup B\)')=100-70=30)।
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