It is a measure of the likelihood of a specified event occurring in an experiment.
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A probability value must always fall within the range of 0 to 1, where 0 represents an impossible event and 1 represents a certain event. Since 1.21 exceeds this range, it is not a valid probability and cannot represent the likelihood of any event occurring. Probabilities greater than 1 do not have a meaningful interpretation in the context of probability theory.
The probability is 0.The probability is 0.The probability is 0.The probability is 0.
The probability is 1.The probability is 1.The probability is 1.The probability is 1.
For any event A, Probability (not A) = 1 - Probability(A)
They are both measures of probability.