यदि \(U={x:x\in \mathbb{N},1\le x\le 20}\) और \(A={x:x\in U,x>12}\) है, तो (n(A')) कितना है?
If \(U={x:x\in \mathbb{N},1\le x\le 20}\) and \(A={x:x\in U,x>12}\), what is (n(A'))?
Explanation opens after your attempt
A. (12)
Concept
\(A={13,14,\ldots,20}\) has (8) elements, so (A') has (12) elements. (x>12) does not include (12).
Why this answer is correct
The correct answer is A. (12). \(A={13,14,\ldots,20}\) has (8) elements, so (A') has (12) elements. (x>12) does not include (12).
Exam Tip
\(A={13,14,\ldots,20}\) में (8) अवयव हैं, इसलिए (A') में (12) अवयव होंगे। (x>12) में (12) शामिल नहीं है।
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