यदि \(U={x:x\in\mathbb{Z},-12\le x\le 12}\) और \(A={x:x\in U,x^2-9x+18\le 0}\), तो (n(A')) क्या है?
If \(U={x:x\in\mathbb{Z},-12\le x\le 12}\) and \(A={x:x\in U,x^2-9x+18\le 0}\), what is (n(A'))?
Explanation opens after your attempt
A. (20)
Concept
The inequality gives \(3\le x\le 6\), so (A) has (4) elements. Since (U) has (25) elements, (n(A')=25-4=21).
Why this answer is correct
The correct answer is A. (20). The inequality gives \(3\le x\le 6\), so (A) has (4) elements. Since (U) has (25) elements, (n(A')=25-4=21).
Exam Tip
असमानता से \(3\le x\le 6\) मिलता है, इसलिए (A) में (4) सदस्य हैं। (U) में (25) सदस्य हैं, अतः (n(A')=25-4=21) नहीं बल्कि (21) होता है।
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