If you are using it in terms of an event (aka rolling a dice, flipping a coin, etc.) it means there is a 50% chance of it happening and not happening. It can be equal to 50% or 1/2 or anything equal to those!
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Two events are equally unlikely if the probability that they do not happen is the same for each event. And, since the probability of an event happening and not happening must add to 1, equally unlikely events are also equally likely,
Two events that have the same chance of happening. For example, if I flip a coin the event of obtaining a 'head' is equally as likely as the event of obtaining a 'tail'. But equally likely does not mean 0.5 probability. It's possible that it's equally likely that someone in Ontario, Canada will die from being stung by a wasp as from being electrocuted in their kitchen at home. Neither event is very likely but the two events could be equally likely.
In common usage, unlikely means a low probability of occurrence. But as a term in mathematics, an unlikely event is not rigorously defined as a "low number" is subjective. Certainly, in a comparative sense, i.e. event A is less likely to occur than event B, we can state that the probability of occurrence of A is less than B.
It is likely to mean deterministic. It means that the outcome of an event is known and not subject to probability.It is likely to mean deterministic. It means that the outcome of an event is known and not subject to probability.It is likely to mean deterministic. It means that the outcome of an event is known and not subject to probability.It is likely to mean deterministic. It means that the outcome of an event is known and not subject to probability.
If you mean what is the probability of getting a heads/tails, it is a 1 in 2 chance (50/50 chance). You are just as likely to get a heads as you are to get a tails.