# Complement Rule for Probability

## If P(A) is is the probability that event A happens then the probability that event A doesn't happen is 1-P(A).

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.
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## The Probability of Complementary Events

by CK-12 //basic
Defines a complementary event and demonstrates how to calculate the the probability of complementary events with practice problems.
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## Probability with Playing Cards and Venn Diagrams

by CK-12 //basic
Learn about probability with Venn diagrams and playing card examples
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• Video

## Probability of Complementary Events - Overview

by CK-12 //basic
Overview
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## Probability of Complementary Events - Example 1

by CK-12 //basic
Finding Probability of Complementary Events
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