Introduction to Proofs Question of the Day

Test your knowledge with a hand-picked multiple-choice question.

If

$\A= \left{\varnothing, 3, 11, 13, 16, 19\right} \B= \left{\varnothing, 3, 4, 11, 16\right} \C= \left{\varnothing, 2, 12, 19\right}$

Find the cardinality of $A\cup A$ .

Select an answer and click Check.

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