\(यदि (U={x:x \in \mathbb{N}, 1\le x\le 20}) और (A={x:x \in U,\ x\) 20 का गुणनखंड है\(}), तो (A^{c}) में कितने अवयव होंगे\)?
\(If (U={x:x \in \mathbb{N}, 1\le x\le 20}) and (A={x:x \in U, x\) is a factor of \(20}), how many elements will (A^{c}) have\)?
Explanation opens after your attempt
C. (14)
Concept
The factors of (20) are ({1,2,4,5,10,20}), so (n(A)=6). Hence (n\(A^{c}\)=20-6=14).
Why this answer is correct
The correct answer is C. (14). The factors of (20) are ({1,2,4,5,10,20}), so (n(A)=6). Hence (n\(A^{c}\)=20-6=14).
Exam Tip
(20) के गुणनखंड ({1,2,4,5,10,20}) हैं, इसलिए (n(A)=6)। अतः (n\(A^{c}\)=20-6=14)।
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