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Mathematics

Probability Calculator

Event probability and odds

🎲Probability Calculator

Probability measures the likelihood of an event, from 0 (impossible) to 1 (certain). P = favourable outcomes / total outcomes. Odds express the same as favourable : unfavourable ratio.

Fun Fact

The gambler's fallacy — believing past outcomes affect future independent events — is one of the most pervasive cognitive biases. Each coin flip is always 50/50 regardless of history.

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