For any two sets $A & B; A \cup B =$

{x : x \in A o r x \in B}

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{x : x \in A o r x \notin B}

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{x : x \notin A o r x \in B}

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Solution

The correct option is A ${x : x \in A o r x \in B}$
We have two sets $A & B .$
Now, $A \cup B$ is the set having elemnets either in $A$ or in $B .$
$\Rightarrow A \cup B = {x : x \in A o r x \in B}$

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