यदि \(U={1,2,\ldots,180}\), (A) (12) के गुणजों का, (B) (15) के गुणजों का और (C) (20) के गुणजों का समुच्चय है, तो (n(\(A\cup B\cup C\)')) कितना है?
If \(U={1,2,\ldots,180}\), (A) is the set of multiples of (12), (B) is the set of multiples of (15), and (C) is the set of multiples of (20), then what is (n(\(A\cup B\cup C\)'))?
Explanation opens after your attempt
A. (150)
Concept
(n\(A\cup B\cup C\)=15+12+9-3-3-3+3=30), so the complement is (180-30=150). In multiples questions, use the least common multiple for common parts.
Why this answer is correct
The correct answer is A. (150). (n\(A\cup B\cup C\)=15+12+9-3-3-3+3=30), so the complement is (180-30=150). In multiples questions, use the least common multiple for common parts.
Exam Tip
(n\(A\cup B\cup C\)=15+12+9-3-3-3+3=30), इसलिए पूरक (180-30=150) है। गुणजों वाले प्रश्न में लघुत्तम समापवर्त्य से साझा भाग निकालें।
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