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  - What Are Complementary Events?
  - Probabilities of Complementary Events
  - Using Complementary Events
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Complementary Events

Introduction to Complementary Events

Two things are often called complementary if, together, they make up a whole.

'Heads or Tails'

'Even or Odd'

Lesson Goals

Define the complement of an event.
Calculate the probability that an event will not occur.
Explore how identifying complementary events can be helpful when calculating probabilities.

Try This!

The weather forecast indicates a \(40\%\) chance of rain tomorrow at 1:00 PM.

There is a \(50\%\) chance that it will not rain tomorrow at 1:00 PM.
There is a \(60\%\) chance that it will be sunny tomorrow at 1:00 PM.

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