# 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

Find out how to calculate combinations given different scenarios.
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## Evaluate Combinations Using Combination Notation

Learn to use combination notation to evaluate combinations.
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## Calculating Combinations II

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## Using Technology

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• PLIX

## Pigeonhole Principle: Friends at a Party

Combination Problems Interactive
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• Critical Thinking

## Combination Problems Discussion Questions

A list of student-submitted discussion questions for Combination Problems.
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• Real World Application

## Combinations

Students will analyze their chances of winning the lottery, using Combinations.
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• Real World Application