The risk of insurance refers to the uncertainty of the outcome of an event under certain circumstances. In terms of probability, uncertainty refers to the probability based on the outcome of an event that is between 0 and 1. When the probability of the event result is 0 or 1, it means that the event is determined to occur or not to occur, so there is no risk. Based on the above definition, Which of the following statements are true:. ['hen the probability of the occurrence of an event is 0, it means that the event is determined not to occur.', 'When the probability of the occurrence of an event is 1, it means that the event is determined to occur.', 'When the probability of the occurrence of an event is 0, it means that the event is determined to occur.', 'The probability of risk must be 0 or 1.']