"The likelihood of two events occurring together is lower than the probability of either alone. For example: The probability of getting one head when flipping a coin is one-half, or .5. And, the probablity of getting two heads when flipping two coins is one-fourth, or .25."
[Coon, Dennis. Introduction to Psychology, Exploration and Application. St. Paul: West Publishing Company, 1989. Chapter: Learning & Cognition]
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