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mathematical expression for the probability of an event a occurring. B Im not sure about this part but is exactly two of the first four events occur equivalent to saying the complement of at most one of the first four events occur intersection at least three of the first four events occur. Learn more about events and types of probability events with examples here.
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Probability is the branch of mathematics concerning numerical descriptions of how likely an event is to occur or how likely it is that a proposition is true. The probability of an event is a number between 0 and 1 where roughly speaking 0 indicates impossibility of the event and 1 indicates certainty. Lets say you win a bar of chocolate if you end up in a red or a pink field.
P AB the conditional probability.
The odds take the probability of an event occurring and divide it by the probability of the event not occurring. P A B the joint probability of events A and B. When we assume that lets say x be the chances of happening an event then at the same time 1-x are the chances for not happening of an event. The odds take the probability of an event occurring and divide it by the probability of the event not occurring.
