If $A = \{x : x^{2} = 4\}$ and $B = \{-2, 2\}$, then $A$ and $B$ are

If $A = \{x : x^{2} = 4\}$ and $B = \{-2, 2\}$, then $A$ and $B$ are
  1. equal
  2. equivalent only
  3. disjoint
  4. empty

Solution

$A = \{-2, 2\} = B$. Same elements, hence equal.

Asked in: MH-SSC-9

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