Question

what is the difference between of probabilities of certain event and impossible event?​

Answer 1

Probability means Chances

certain mean get sure about something निश्चित

Answer 2

The probabilities  of an event is a number describing the chance that the event  will happen. An event that is certain  to happen has a probability of 1. An event that cannot possibly happen has a probability of zero. If there is a chance that an event will happen, then its probability is between zero and 1.

It depends what you mean by "Probability of impossible event". This is an ambiguous phrase which would be interpreted in several different ways: 1) The event is known ahead of time to be not possible, therefore by definition in mathematics, the probability is defined to be 0 which means it can never happen.