यदि \(X_1={x:x\in \mathbb{Z}, x^2=25}\) और \(Y_1={5,-5,5}\) हैं, तो सही कथन कौन-सा है?
If \(X_1={x:x\in \mathbb{Z}, x^2=25}\) and \(Y_1={5,-5,5}\), which statement is correct?
Explanation opens after your attempt
A. \(X_1=Y_1\)
Concept
The integer solutions of \(x^2=25\) are (-5) and (5).
Why this answer is correct
In \(Y_1\), (5) is written twice, but repetition is ignored in a set.
Exam Tip
Before checking equality, remove repeated elements. चरण 1: \(x^2=25\) के पूर्णांक हल (-5) और (5) हैं। चरण 2: \(Y_1\) में (5) दो बार लिखा है, पर समुच्चय में दोहराव नहीं गिना जाता। चरण 3: समानता जाँचने से पहले दोहराए हुए अवयव हटाएँ।
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