यदि \(U={x:x \in \mathbb{N},x\le 60}\), \(A={x:x \in U,4\mid x}\) और \(B={x:x \in U,9\mid x}\), तो (n(\(A\cup B\)')) क्या है?
If \(U={x:x \in \mathbb{N},x\le 60}\), \(A={x:x \in U,4\mid x}\), and \(B={x:x \in U,9\mid x}\), what is (n(\(A\cup B\)'))?
Explanation opens after your attempt
A. (40)
Concept
Numbers divisible by (4) or (9) are (15+6-1=20). So the complement has (60-20=40) elements.
Why this answer is correct
The correct answer is A. (40). Numbers divisible by (4) or (9) are (15+6-1=20). So the complement has (60-20=40) elements.
Exam Tip
(4) या (9) से विभाज्य संख्याएं (15+6-1=20) हैं। इसलिए पूरक में (60-20=40) सदस्य हैं।
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