There is always a certain probability of an electron releasing a photon.
The system has a certain probability to jump from the initial to the final potential energy curves.
But, at a certain probability, a terminator will be put in place, and the reaction stops.
Within a second's time, a radioactive particle has a certain probability that it will decay.
As with all predictive procedures, they are not absolute but have a certain probability of success.
Many algorithms will only give the correct answer with a certain probability.
Each electron final position has a certain probability of happening.
The ultimate limit state is the theoretical failure point with a certain probability.
Sometimes, the statement is that the limit of certain probabilities must be 0 or 1.
Risky events have a certain probability for a given outcome.