यदि \(U={1,2,\ldots,120}\), (A), (B), (C) क्रमशः (4), (6), (10) के गुणजों के समुच्चय हैं, तो (|\(A\cup B\cup C\)'|) कितना है?
If \(U={1,2,\ldots,120}\), (A), (B), (C) are respectively the sets of multiples of (4), (6), and (10), what is (|\(A\cup B\cup C\)'|)?
Explanation opens after your attempt
B. (74)
Concept
By inclusion-exclusion, \(|A\cup B\cup C|=30+20+12-10-6-4+2=44\). Hence the complement is (120-44=76).
Why this answer is correct
The correct answer is B. (74). By inclusion-exclusion, \(|A\cup B\cup C|=30+20+12-10-6-4+2=44\). Hence the complement is (120-44=76).
Exam Tip
समावेशन-बहिष्करण से \(|A\cup B\cup C|=30+20+12-10-6-4+2=44\)। इसलिए पूरक में (120-44=76) नहीं, ध्यान से सही गणना (30+20+12-10-6-4+2=44) और (120-44=76) है।
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