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Logic  /  Logic 345  ·  Atom · ~20 seconds

Conjunction: Independent Events

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For independent events, P(A and B) = P(A) × P(B).

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Two fair coins, two heads: ½ × ½ = ¼.

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*Independent* is the license. Multiplying dependent probabilities as if independent is the calculus's most consequential misuse — courtrooms included.