# 12.16: Complement Rule for Probability

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complement

A mutually exclusive pair of events are complements to each other. For example: If the desired outcome is heads on a flipped coin, the complement is tails.Complement rule

The Complement Rule states that the sum of the probabilities of an event and its complement must equal 1, or for the event A, P(A) + P(A') = 1.enumerate

Enumerate means to catalogue or list members independently.Probability

Probability is the chance that something will happen. It can be written as a fraction, decimal or percent.Venn diagrams

A diagram of overlapping circles that shows the relationship among members of different sets.### Image Attributions

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Learn how to find the probability of complementary events.

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Date Created:

Oct 29, 2012
Last Modified:

Aug 16, 2016
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