# Combination Problems

## Using n!/r!(n - r)! to calculate permutations

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.

## Combination Problems

by CK-12 //basic
Use technology to solve combination problems.
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## Combination Problems Principles

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

by CK-12 //basic
This video shows how to work step-by-step through one or more of the examples in Combination Problems.
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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: 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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• Lesson Plan

## Using Technology to Find Combinations Lesson Plan

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