# Combinations

## The number of possible groupings when order does not matter.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Combinations

by CK-12 //basic
Use the formula for combinations.
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## Combinations

by CK-12 //basic
Learn how to distinguish between permutations and combinations.
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## Combinations Principles

by CK-12 //basic
This video gives more detail about the mathematical principles presented in Combinations.
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## Combinations Examples

by CK-12 //basic
This video shows how to work step-by-step through one or more of the examples in Combinations.
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## Combinations

by CK-12 //basic
Introduces the formula for combinations in order to find how many subsets of a certain number we can take out of a set of a given number.
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## Combinations - Example 1

by CK-12 //basic
Word Problems - Find the number of combinations of n elements taken r at a time
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## Combinations: An Introduction

by CK-12 //basic
Introduces combinations and explains how to evaluate combinations as well as solve counting problems using combinations.
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## Combinations - Example 2

by CK-12 //basic
Finding the Number of Combinations Given One Event
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## Combinations - Example 3

by CK-12 //basic
Multiplying Combinations Given Multiple Events
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• Lesson Plan

## Combinations Lesson Plan

by CK-12 //basic
This lesson plan covers Combinations and includes Teaching Tips, Common Errors, Differentiated Instruction, Enrichment, and Problem Solving.
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