yes, but only with memorization and scripts
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Event A denotes the complement of event A, meaning that Ā consists of all outcomes in which event A does not occur. Event A and Ā must be disjoint, because it is impossible for an event and its complement to occur at the same time.
becuse it talks about the same thing
It does not, so the question is based on a misunderstanding of probability.
If the probability of an event occurring is p, then 1-p represents the probability of the same event not occurring. The value of p must lie between 0 and 1.
The answer depends on whether or not the events are independent, whether or not the probabilities are the same for each event etc. Without that information, there cannot be an answer.