Let $A = {a, b}, B = {a, b, c} .$ Is $A \subset B$ ? What is $A \cup B$ ?

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Solution

Here, $A = {a, b}$ and $B = {a, b, c}$
Since, every element of set A is in set B. So, $A \subset B$
$A \cup B = {a, b, c} = B$

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