यदि (|U|=80), (|A|=35), (|B|=40) और \(|A\cap B|=15\), तो (|\(A\cup B\)'|) कितना है?
If (|U|=80), (|A|=35), (|B|=40) and \(|A\cap B|=15\), what is (|\(A\cup B\)'|)?
Explanation opens after your attempt
A. (20)
Concept
\(|A\cup B|=35+40-15=60\), so the complement has (80-60=20) elements. Find the union count first.
Why this answer is correct
The correct answer is A. (20). \(|A\cup B|=35+40-15=60\), so the complement has (80-60=20) elements. Find the union count first.
Exam Tip
\(|A\cup B|=35+40-15=60\), इसलिए पूरक में (80-60=20) अवयव हैं। पहले संघ की संख्या निकालें।
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