यदि \(A={x:x\in\mathbb{Z},x^2\leq 9}\), तो (A) में कितने तत्व हैं?
If \(A={x:x\in\mathbb{Z},x^2\leq 9}\), how many elements are in (A)?
Explanation opens after your attempt
C. (7)
Concept
For \(x^2\leq9\), integers range from (-3) to (3).
Why this answer is correct
The elements are (-3,-2,-1,0,1,2,3).
Exam Tip
With \(\leq\), boundary values are also counted. चरण 1: \(x^2\leq9\) के लिए पूर्णांक (-3) से (3) तक होंगे। चरण 2: तत्व (-3,-2,-1,0,1,2,3) हैं। चरण 3: \(\leq\) होने पर सीमा वाले मान भी गिने जाते हैं।
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