Find the union of each of the following pairs of sets :
$A = \{ x:x$ is a natural number and $1\, < \,x\, \le \,6\} $
$B = \{ x:x$ is a natural number and $6\, < \,x\, < \,10\} $
Find the union of each of the following pairs of sets :
$A = \{ x:x$ is a natural number and $1\, < \,x\, \le \,6\} $
$B = \{ x:x$ is a natural number and $6\, < \,x\, < \,10\} $
$A = \{ x:x$ is a natural number and $1\, < \,x\, \le \,6\} = \{ 2,3,4,5,6\} $
$B = \{ x:x$ is a natural number and $6\, < \,x\, < \,10\} = \{ 7,8,9\} $
$A \cup B=\{2,3,4,5,6,7,8,9\}$
$\therefore A \cup B = \{ x:x \in N$ and $1\, < \,x\, < \,10\} $
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