Introduction to set theory

What is a set?

• A method of solving problems

• A collection of objects

• A 2-D shape

• {7}

 $\left\{\frac{a}{b}\left|a,b\in Z;b\ne0\right|\right\}\$  defines what basic set?

• Reals

• Naturals

• Rationals

• Integers

{1,2,3,4,5,6} which set is a subset of this?

• {1,3,5}

• {0,1,2}

• {4,6,8}

• {1.1,2,3}

"Roster method" is a method to designate a set by describing.

• True

• False

Which method is used to designate the set { x | x ∈ N and x > 4 } ?

• Roster Method

• Descriptive Method

• Set-builder Notation

Empty set is a set with infinite elements.

• True

• False

Which of the following sets is empty?

• { x | x is a natural number divisible by 2 }

• { x | x is a human being traveled to the sun }

• { x | x is an even number between 3 and 5 }

The cardinal number of A = { x | x ∈ O and 10<x<20 }

• 5

• 10

• 15

{ x | x is a natural number greater than 20 } is :

• Finite Set

• Infinite Set

Tags

CCSS.6.EE.B.5

CCSS.6.EE.B.8

{ three } and { t, h, r, e, e } are :

• Equal

• Equivalent

• Equal and Equivalent

• Neither