If 3/10 is the probability that an event will happen, what is the probability that it will not happen

If 3/5 is the probability of an event A what is the probability of the event not A.

The probability that an event will fail to happen is 0.05. The probability that the event will take place on 4 consecutive occasions is

The probability that an event will fail to happen is 0.05. The probability that the event will take place on 4 consecutive occasions is

The probability that an event does not happen in one trial is 0.8 The probability that the event happens atmost once in three trials is

The probability that an event does not happen in one trial is 0.8 The probability that the event happens atmost once in three trials is

E and F are two independent events. The probability that both e and F happen is 1/12 and the probability that neither E nor F happens is 1/2. Then

The probability that an event does not happen in one trial is 0.8. The probability that the even happens atmost once in three trials is

E and F are two independent events. The probability that both E and F happen is 1/12 and the probability that neither E nor F happens is 1/2. Then

E and F are two independent events.The probability that both e and F happen is 1/12 and the probability that neither E nor F happens is 1/2. Then

The probability than an event does not happen in one trail is 0.8. The probability that the event happens atmost once in three trails is