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Probability is a branch of mathematics that quantifies uncertainty. It is a numerical measure of how likely an event is to occur, with values ranging from 0 (impossible) to 1 (certainty). A probability of 0.50 indicates an event is equally likely to happen or not happen.123

Odds, while related, can refer to the ratio of the probability of one event occurring versus another, or the chances of winning a bet. For example, the odds of winning a lottery might be stated as 200 million to one. Likelihood is often used synonymously with probability, representing the subjective assessment of possibility.4567

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