\(यदि (W={x\in \mathbb{Z}: -3\le x\le 3\) और \(x^2\) सम है}), तो (W) क्या है?
\(If (W={x\in \mathbb{Z}: -3\le x\le 3\) and \(x^2\) is even}), what is (W)?
Explanation opens after your attempt
A. \(W=\{-2,0,2\}\)
Concept
(-3) से (3) तक पूर्णांक (-3,-2,-1,0,1,2,3) हैं। / The integers from (-3) to (3) are (-3,-2,-1,0,1,2,3).
Why this answer is correct
\(x^2\) सम तब होगा जब (x) सम हो। इसलिए सदस्य (-2,0,2) हैं। / \(x^2\) is even when (x) is even. So the elements are (-2,0,2).
Exam Tip
सम-विषम का गुण वर्ग लेने पर भी बना रहता है। / Evenness and oddness are preserved when squaring an integer.
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