Negative probability is a concept that arises in some theoretical contexts in probability theory, but it is not part of standard probability theory where probabilities are defined to be non-negative and sum up to one for a given probability space. In classical probability theory, a probability value must lie within the range of 0 to 1, inclusive. However, the idea of negative probabilities has been discussed in areas such as quantum mechanics, information theory, and some branches of statistical physics.
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