Outcome (probability)

For comparison, we could define an event to occur when "at least one 'heads'" is flipped in the experiment - that is, when the outcome contains at least one 'heads'.

However, this approach does not work well in cases where the sample space is uncountably infinite (most notably when the outcome must be some real number).

For example, when tossing an ordinary coin, one typically assumes that the outcomes "head" and "tail" are equally likely to occur.

An implicit assumption that all outcomes are equally likely underpins most randomization tools used in common games of chance (e.g. rolling dice, shuffling cards, spinning tops or wheels, drawing lots, etc.).

Of course, players in such games can try to cheat by subtly introducing systematic deviations from equal likelihood (for example, with marked cards, loaded or shaved dice, and other methods).