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Probability of Complementary Events

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Videos, worksheets, games and activities to help Algebra II students learn about the probability of complementary events.

Using the Complement to Calculate Probability :
Sometimes calculating probability can be fairly complicated, but we have tricks to make it easier. Calculating probability of the complement of an event can be easier than calculating the probability of the event itself. We can use the probability of the complement to find the probability of the event by subtracting it from one. This trick is often used when calculating the probability of multiple events.

How to use the complement to calculate the probability of an event.

This video provides two basic examples of how to find the complement of an event.

The following video shows another example of calculating the probability of complementary events.
Probability using Complement Rule
Three numbers are chosen at random from the whole numbers between 1 and 10 (inclusive) with replacement. Find the probability that at least one of the numbers is an even number.

Probability Problem Involving 'At Least' and 'Complements'
Here we have a typical probability problem: 5 students pick from 12 distinct watches. We find the probability that at least 2 of them pick the same type of watch. We use complements and permutations to find the solution.

How to Find the Complement of an Event and Odds
This video covers how to find the theoretical probability using the complement of an event. Also, how to find the odds for and against an event is discussed.

Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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