Probability of an event that is impossible

Question

What is the probability of an event that is impossible? Suppose that a probability is approximated to be zero based on empirical results. Does this mean that the event is impossible?
What is the probability of an event that is impossible?

Answer 1

The mathematical ideal probability of an impossible event is zero.

 

The probability of an event that is theoretically possible but which has never been observed empirically is essentially zero.