If $A = \{1, 2, 3\}$ and $B = \{3, 4, 5\}$, then $A \cup B$ is

If $A = \{1, 2, 3\}$ and $B = \{3, 4, 5\}$, then $A \cup B$ is
  1. $\{1, 2, 3, 4, 5\}$
  2. $\{3\}$
  3. $\{1, 2, 4, 5\}$
  4. $\{1, 2, 3, 3, 4, 5\}$

Solution

Union: all elements of either set, listed once.

Asked in: MH-SSC-9

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