Question 1126252
probability of no accident on a given day is 0.999
For a year of 230 days, that probability of no accident is 0.999^230=0.7944

For 10 years, it would be 0.1001
For 30 years, it would be 0.0010

At least one accident has a probability of 1-prob(no accident) or 0.2056 year1

For 10 years,it would be 0.8999
For 30 years, it would be 0.9990

The first part is closest--low probability events that over a long period of time have an expected value > 0 will eventually happen.  Expected value here is probability * time