यदि \(U={1,2,\ldots,72}\), \(A={x:x\in U,4\mid x}\), \(B={x:x\in U,6\mid x}\) और \(C={x:x\in U,9\mid x}\), तो (n(\(A\cup B\cup C\)')) क्या है?
If \(U={1,2,\ldots,72}\), \(A={x:x\in U,4\mid x}\), \(B={x:x\in U,6\mid x}\), and \(C={x:x\in U,9\mid x}\), what is (n(\(A\cup B\cup C\)'))?
Explanation opens after your attempt
A. (42)
Concept
By inclusion-exclusion, (n\(A\cup B\cup C\)=18+12+8-6-2-4+2=28). Therefore the complement is (72-28=44).
Why this answer is correct
The correct answer is A. (42). By inclusion-exclusion, (n\(A\cup B\cup C\)=18+12+8-6-2-4+2=28). Therefore the complement is (72-28=44).
Exam Tip
समावेशन-बहिष्करण से (n\(A\cup B\cup C\)=18+12+8-6-2-4+2=28) है। इसलिए पूरक (72-28=44) नहीं बल्कि (44) है।
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