Set Theory and Probability (Junior Cert Mathematics): Quizzes

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Set Theory and Probability
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What is a set?

A collection of elements

What does the union of two sets (A∪BA ∪ B) represent?

Elements in A, B, or both

What does the intersection (A∩BA ∩ B) mean?

Elements in both A and B

If set AA is people who like Facebook, what is A′A'?

People who don't like Facebook

In a Venn Diagram, what do overlapping parts of circles show?

The intersection

In the example, how many people like only Facebook?

9

What is PP(likes both Facebook and Twitter)?

120\frac{1}{20}

What is PP(likes Facebook or Twitter)?

45\frac{4}{5}

What is PP(likes only Facebook)?

920\frac{9}{20}

In the example, how many like Facebook or Twitter (F∪TF ∪ T)?

16 people

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