यदि (n(U)=90), (n\(A^c\)=35), (n\(B^c\)=50) और (n\(A^c\cap B^c\)=18) है, तो (n\(A\cap B\)) कितना होगा?
If (n(U)=90), (n\(A^c\)=35), (n\(B^c\)=50), and (n\(A^c\cap B^c\)=18), what is (n\(A\cap B\))?
Explanation opens after your attempt
A. (23)
Concept
(n\(A^c\cup B^c\)=35+50-18=67). By De Morgan, this is (n(\(A\cap B\)^c)), so (n\(A\cap B\)=90-67=23).
Why this answer is correct
The correct answer is A. (23). (n\(A^c\cup B^c\)=35+50-18=67). By De Morgan, this is (n(\(A\cap B\)^c)), so (n\(A\cap B\)=90-67=23).
Exam Tip
(n\(A^c\cup B^c\)=35+50-18=67) है। डी मॉर्गन से यह (n(\(A\cap B\)^c)) है, इसलिए (n\(A\cap B\)=90-67=23)।
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