The probability of certain event is one
- The probability of certain event is one true or false
- The probability of event is one
- The value of the probability of certain event is one
- The probability of impossible event is one true or false
- The probability of dash event is one
- The probability of sure event is one
- The probability of impossible event is one
- The probability of sure event is one true or false
- The value of the probability of a certain event is one true or false
- The probability of an event that is certain to occur is one
- The probability of an event that is certain to happen is one