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Consider the sets $A=\\{\\var{a},2,\\var{b}\\}$ and $B=\\{\\var{b},\\var{c},2\\}$, and let $X$ and $Y$ be any two sets.

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Listing them in ascending numerical order (smallest to largest), the elements of $A\\cup B$ are [[0]], [[1]], [[2]] and [[3]].

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Listing them in ascending numerical order (smallest to largest), the elements of $A\\cap B$ are [[0]] and [[1]].

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If $X$ and $Y$ are disjoint, then the cardinality of $X\\cap Y$ is [[0]].

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Which of the following statements are true for all sets $A$, $B$ and $C$? More than one of these may be a true statement. Note that you will lose marks if you tick a box as true when it is in fact false in general.

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