Answer
$A=\{x | x \text { is an odd natural number and } x<9\}$
according to the above statement set $A=\{1,3,5,7\}$
$U=\{x | x \in \mathbf{N} \text { and } x<9\}$
according to the above statement set $B=\{1,2,3,4,5,6,7,8\}$
The set $A \cup U$ is a set of all elements in $A\ $and all element in $B$ that are not in $A$
$\therefore$ $A \cup U=\{1,2,3,4,5,6,7,8\}$
Work Step by Step
$A=\{x | x \text { is an odd natural number and } x<9\}$
according to the above statement set $A=\{1,3,5,7\}$
$U=\{x | x \in \mathbf{N} \text { and } x<9\}$
according to the above statement set $B=\{1,2,3,4,5,6,7,8\}$
The set $A \cup U$ is a set of all elements in $A\ $and all element in $B$ that are not in $A$
$\therefore$ $A \cup U=\{1,2,3,4,5,6,7,8\}$
