Set Notation

Multiple Choice

Which of the following sets is described by listing its elements as {a, e, i, o, u}?

• Set A: my three favorite colors

• Set B: vowels in the English alphabet

• Set C: seven largest moons in the solar system

• Set D: integers between 1 and 21

Open Ended

Explain why the set of ages in a class with ten students aged 16 and four students aged 15 is written as {15, 16} and not as {16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15}.

Multiple Choice

What is a set in mathematics?

• A collection of objects

• A single object

• A type of number

• A mathematical operation

Multiple Choice

What is each member of a set called?

• Element

• Object

• Group

• Subset

Multiple Choice

Which of the following sets is infinite?

• A = {knife, fork, spoon}

• N = {0, 1, 2, 3, ...}

• D = {2, 3, 4, ..., 20}

• B = {a, e, i, o, u}

Open Ended

List the elements of the set D, where D is the set of positive integers less than 30 that are multiples of 4. How many elements are in this set?