If $A = {x : x is an even number and 0 < x < 10}$ and $B = {2, 3, 5, 7}$ , then the number of elements in $A \cup B$ is

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Solution

Given
$A = {2, 4, 6, 8}$
$B = {2, 3, 5, 7}$
then
$A \cup B = {2, 3, 4, 5, 6, 7, 8}$
Hence, the number of element $= 7$

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