यदि (n(U)=80), (n(A)=35), (n(B)=42) और (n\(A \cap B\)=18), तो (n(\(A \cup B\)')) क्या होगा?
If (n(U)=80), (n(A)=35), (n(B)=42), and (n\(A \cap B\)=18), what is (n(\(A \cup B\)'))?
Explanation opens after your attempt
A. (21)
Concept
(n\(A \cup B\)=35+42-18=59), so the complement is (80-59=21). Find the union first, then take the complement.
Why this answer is correct
The correct answer is A. (21). (n\(A \cup B\)=35+42-18=59), so the complement is (80-59=21). Find the union first, then take the complement.
Exam Tip
(n\(A \cup B\)=35+42-18=59), इसलिए पूरक (80-59=21) है। पहले संघ निकालें फिर पूरक लें।
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