यदि \(U={1,2,\ldots,90}\), (A), (B), (C) क्रमशः (2), (3), (5) के गुणजों के समुच्चय हैं, तो (|\(A\cup B\cup C\)'|) कितना है?
If \(U={1,2,\ldots,90}\), (A), (B), (C) are respectively the sets of multiples of (2), (3), and (5), what is (|\(A\cup B\cup C\)'|)?
Explanation opens after your attempt
B. (24)
Concept
By inclusion-exclusion, \(|A\cup B\cup C|=45+30+18-15-9-6+3=66\). So the complement has (90-66=24) elements.
Why this answer is correct
The correct answer is B. (24). By inclusion-exclusion, \(|A\cup B\cup C|=45+30+18-15-9-6+3=66\). So the complement has (90-66=24) elements.
Exam Tip
समावेशन-बहिष्करण से \(|A\cup B\cup C|=45+30+18-15-9-6+3=66\)। इसलिए पूरक में (90-66=24) अवयव हैं।
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