यदि \(U={x:x \in \mathbb{Z},0\le x\le 20}\) और \(A={x:x \in U,x^2-9x+20=0}\), तो (A') में (5) से छोटे सदस्यों की संख्या कितनी है?
If \(U={x:x \in \mathbb{Z},0\le x\le 20}\) and \(A={x:x \in U,x^2-9x+20=0}\), how many elements of (A') are less than (5)?
Explanation opens after your attempt
A. (5)
Concept
The equation gives \(A=\{4,5\}\). Elements less than (5) are (0,1,2,3,4), and (4) is removed, so (4) elements remain.
Why this answer is correct
The correct answer is A. (5). The equation gives \(A=\{4,5\}\). Elements less than (5) are (0,1,2,3,4), and (4) is removed, so (4) elements remain.
Exam Tip
समीकरण से \(A=\{4,5\}\) है। (5) से छोटे सदस्य (0,1,2,3,4) हैं, इनमें (4) हटेगा, इसलिए (4) नहीं बल्कि (4) सदस्य बचते हैं।
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