If there are two possible outcomes, the probability would be 50% or 1/2 (AN EVEN CHANCE). "Equally likely events" refers to the chances of each possible outcome among many being equal. For example, using a six-sided die in a dice game yields a 1/6 chance for any one of the numbers to appear on top of the cube. Assuming that the die is not loaded, all six numbers are presumed to have an equal likelihood to end up on top in a given throw.
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If you can enumerate the outcome space into equally likely events, then it is the number of outcomes that are favourable (in which the event occurs) divided by the total number of outcomes.
It refers to two event which are equally likely to occur.
The modelling of a probability distribution function for an event from a theoretical approach.
Without more information all you can say is that they it is some non-negative number less than or equal to 0.5.
Each outcome has a probability of 0.05