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The probability that an event does not occur is always equal to 1 minus the probability that the event occurs, because the probability of an event combined with the probability of the event not occurring is equal to all possible outcomes, which has a probability of 1.
This means that:
P(E) = 1 - P(E prime)
And if P(E prime) = .56, we can substitute this value into the equation to get:
P(E) = 1 - .56 = .44
So we can figure out that P(E) = .44