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Types of random events

Trial and sample space
Random experiment (trial) is an action after which the outcome is not known in advance under fixed conditions (tossing a coin, drawing a ball from an urn, etc.). Elementary outcome ω\omega — an indivisible “atomic result” from which the description of the experiment is built. Sample space Ω\Omega — the set of all elementary outcomes in the given setup. Event AA — a subset of Ω\Omega: “the experiment produced an outcome that falls in AA**.
The set Ω\Omega itself depends on what you agreed to count as one elementary outcome
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