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Question

Let $A$ and $B$ have 3 and 6 elements respectively. What can be the minimum number of elements in $A union B$ ?

$R \subset I$
$I \subset R$ (c) $R = I$
9
None of these

The correct answer is: None of these

$A union B$ will contain minimum number of elements if $A subset of B$ and in that case, we have
$n open parentheses A union B close parentheses equals n open parentheses B close parentheses equals 6$

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