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Statistics and probability

Lesson 3: Basic set operations

Basic set notation

CCSS.Math: HSS.CP.A.1

Let X and Y be the following sets:

X, equals, left brace, 10, comma, 20, comma, 30, right brace

Y, equals, left brace, 5, comma, 10, comma, 15, comma, 20, right brace

Which of the following is the set X, \cap, Y?

(Choice A)
left brace, 5, comma, 10, comma, 15, comma, 20, comma, 30, right brace
(Choice B)
left brace, 5, comma, 15, comma, 30, right brace
(Choice C)
left brace, 10, comma, 20, right brace
(Choice D)
left brace, right brace

Stuck?