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.
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The complement is "Not four heads", that is, at least one tails.
Determinism.
P(A given B')=[P(A)-P(AnB)]/[1-P(B)].
The probability of the complement of an event, i.e. of the event not happening, is 1 minus the probability of the event.
The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.