# Roster Method & Set-Builder Notation...3

Discussion in 'Algebra' started by nycmathguy, Jun 24, 2022.

1. ### nycmathguy

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College Algebra
Chapter 1/Section 1
Review

We begin our College Algebra journey with a review of the basics according to the author of the textbook.

Working with sets.

There are two methods for denoting sets:

Roster Method
Set-Builder Notation

Let O = set of odd digits

Roster Method

O = {1, 3, 5, 7, 9 }

I never understood 1 as an odd digit.

You say?

Set-Builder Notation

O = { x| x is an odd digit }

You say?

nycmathguy, Jun 24, 2022
2. ### MathLover1

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I never understood 1 as an odd digit.
Odd numbers are positive integers that cannot be categorized into groups of two. For example: 1, 3, 5, 7, etc.

MathLover1, Jun 24, 2022
nycmathguy likes this.
3. ### nycmathguy

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What do you mean that odd numbers cannot be categorized into groups of two?

nycmathguy, Jun 24, 2022
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