Number of elements in $\{x : x$ is an integer, $x^{2} = 9\}$ is

Number of elements in $\{x : x$ is an integer, $x^{2} = 9\}$ is
  1. $2$
  2. $1$
  3. $0$
  4. $3$

Solution

$x^{2} = 9 \Rightarrow x = \pm 3$. Set $= \{-3, 3\}$.

Asked in: MH-SSC-9

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