If the probability that an event will occur is p and the probability that it will not occur is q, which of the following is true?
The probability that an event will certainly occur + the probability that an event will certainly not occur =
The probability that an event will certainly occur = 1 - the probability that an event will certainly not occur
The probability that an event will certainly not occur = 1 + The probability that an event will certainly occur
Option C is true.
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