The possibility that there will be only two outcomes which states that an event will occur or not is called?

Concept: The likelihood that there will only be two outcomes, one of which states whether or not an event will take place.

Complementary occurrences include things like someone coming to your house or not coming to your house, getting a job or not getting a job, and so on.

In other words, the probability of an event occurring in the exact opposite direction of the probability of it not occurring.

For example;

1.He may or may not come today!

2.If a coin is tossed single time there can be only two events that is head or tail.

3.You may win or lose.