यदि \(U={1,2,\ldots,84}\), (A) (7) के गुणजों का और (B) (4) के गुणजों का समुच्चय है, तो (n(\(A\cup B\)')) कितना है?
If \(U={1,2,\ldots,84}\), (A) is the set of multiples of (7) and (B) is the set of multiples of (4), then what is (n(\(A\cup B\)'))?
Explanation opens after your attempt
A. (54)
Concept
Multiples of (7) are (12), multiples of (4) are (21), and multiples of (28) are (3), so the union is (30) and the complement is (84-30=54).
Why this answer is correct
The correct answer is A. (54). Multiples of (7) are (12), multiples of (4) are (21), and multiples of (28) are (3), so the union is (30) and the complement is (84-30=54).
Exam Tip
(7) के गुणज (12), (4) के गुणज (21), और (28) के गुणज (3) हैं, इसलिए संघ (30) और पूरक (84-30=54) है।
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