यदि \(U={1,2,\ldots,60}\), (A) (3) के गुणजों का समुच्चय और (B) (4) के गुणजों का समुच्चय है, तो (n(\(A\cup B\)')) कितना होगा?
If \(U={1,2,\ldots,60}\), (A) is the set of multiples of (3) and (B) is the set of multiples of (4), then what is (n(\(A\cup B\)'))?
Explanation opens after your attempt
A. (30)
Concept
Multiples of (3) are (20), multiples of (4) are (15), and multiples of (12) are (5), so the union is (30) and the complement is (60-30=30). Subtract common multiples once.
Why this answer is correct
The correct answer is A. (30). Multiples of (3) are (20), multiples of (4) are (15), and multiples of (12) are (5), so the union is (30) and the complement is (60-30=30). Subtract common multiples once.
Exam Tip
(3) के गुणज (20), (4) के गुणज (15), और (12) के गुणज (5) हैं, इसलिए संघ (30) और पूरक (60-30=30) है। साझा गुणजों को एक बार घटाएँ।
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