It means there is virtually no chance an event will happen.
Chat with our AI personalities
Zero is the smallest probability.
A probability event that is impossible is one that will not happen, i.e. its probability is zero.
zero
An impossible event has a probability of 0 (or 0%).
If an event has a probability of zero (0) that means that it cannot happen; it is completely impossible.If a number has a probability of zero, then it never occurs, no matter how many times you try.