Question

The probability of non accurance of the event A is 4 then find the probability of occurrence of event A

Answer 1

the probability of either non-occurrence or occurrence does not exceed 1

Answer 2

The probability does not exceed, it remains b/w 0 and 1 only.
So here, you have said the probability is 4. That's not possible. Taking you question as a typing error, I will consider it as ¼.


Probability of non occurrence of an event = ¼

So, probability of occurrence of an event = 1 - ¼ = ¾