Find the union of each of the following pairs of sets:
$A = \{1, 2, 3\}, B = \varnothing$

  • A
    $A \cup B = \{1, 2, 3\}$
  • B
    $A \cup B = \{1, 2, 3, \varnothing\}$
  • C
    $A \cup B = \varnothing$
  • D
    $A \cup B = \{1, 2, 3, 0\}$

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