यदि \(U={x:x\in\mathbb{N},x\le 120}\), \(A={x:x\in U,8\mid x}\), \(B={x:x\in U,15\mid x}\) और \(C={x:x\in U,20\mid x}\), तो (n(\(A\cup B\cup C\)')) क्या है?
If \(U={x:x\in\mathbb{N},x\le 120}\), \(A={x:x\in U,8\mid x}\), \(B={x:x\in U,15\mid x}\), and \(C={x:x\in U,20\mid x}\), what is (n(\(A\cup B\cup C\)'))?
Explanation opens after your attempt
A. (96)
Concept
By inclusion-exclusion, (n\(A\cup B\cup C\)=15+8+6-1-3-2+1=24). Therefore the complement has (120-24=96) elements.
Why this answer is correct
The correct answer is A. (96). By inclusion-exclusion, (n\(A\cup B\cup C\)=15+8+6-1-3-2+1=24). Therefore the complement has (120-24=96) elements.
Exam Tip
समावेशन-बहिष्करण से (n\(A\cup B\cup C\)=15+8+6-1-3-2+1=24) है। इसलिए पूरक में (120-24=96) सदस्य होंगे।
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