यदि \(U=\{1,2,3,4,5,6,7,8\}\), \(A=\{1,2,3\}\) और \(B=\{4,5\}\) है, तो (\(A\cup B\)') में कितने अवयव हैं?
If \(U=\{1,2,3,4,5,6,7,8\}\), \(A=\{1,2,3\}\), and \(B=\{4,5\}\), how many elements are in (\(A\cup B\)')?
Explanation opens after your attempt
A. (3)
Concept
\(A\cup B={1,2,3,4,5}\), so its complement ({6,7,8}) has (3) elements. First count the union.
Why this answer is correct
The correct answer is A. (3). \(A\cup B={1,2,3,4,5}\), so its complement ({6,7,8}) has (3) elements. First count the union.
Exam Tip
\(A\cup B={1,2,3,4,5}\), इसलिए पूरक ({6,7,8}) में (3) अवयव हैं। पहले संघ की संख्या देखें।
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