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

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Solution

Given: $A = {a, b}, B = {a, b, c}$
$∵ a \in A$ and $a \in B$
Also, $b \in A$ and $b \in B$
$∴$ Yes, $A \subset B$
Union of the pair of set is
$A \cup B = {a, b, c} = B$

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