# Which of the following values cannot be a probability of an event?

**Question: Which of the following values cannot be a probability of an event?**

In probability theory, the probability of an event is a number between 0 and 1, inclusive. A probability cannot be less than 0, as this would indicate a negative likelihood of an event occurring, which is not possible in the framework of probability. Similarly, a probability cannot be greater than 1, as this would suggest that an event is more than certain to occur, which again, is not possible. Therefore, any value less than 0 or greater than 1 cannot be a probability of an event. Probabilities are often expressed as fractions, decimals, or percentages, but regardless of the format, they must adhere to this fundamental rule.

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