यदि \(U=\{1,2,3,4,5,6,7\}\), \(A=\{1,4,7\}\), तो \(A^{c}\cup A\) में कितने अवयव हैं?
If \(U=\{1,2,3,4,5,6,7\}\), \(A=\{1,4,7\}\), how many elements are in \(A^{c}\cup A\)?
Explanation opens after your attempt
C. (7)
Concept
\(A^{c}\cup A=U\), so it has (7) elements. Using the identity directly saves time.
Why this answer is correct
The correct answer is C. (7). \(A^{c}\cup A=U\), so it has (7) elements. Using the identity directly saves time.
Exam Tip
\(A^{c}\cup A=U\), इसलिए इसमें (7) अवयव हैं। सर्वसमिका को सीधे उपयोग करने से समय बचता है।
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