What is probability of occurrence of event

1.What is the probability of occurrence of an event?

If A and B are two eveuts, then what is the probability of occurrence of either event A or event B?

If P (E) denotes probability of occurrence of event E, then :

Occurrence of an event

A die is thrown once. What is the probability of occurrence of an odd number on the upper face?

The probability of an occurrence of event A is 0.7 and that of the occurrence of event B is 0.3 and the probability of occurrence of both is 0.4.

If 7/10 is the probability of occurrence of an event, what is the probability that it does not occur ?

If the probability of occurrence of an event is p then the probability of non-happening of this event is