What is the gambler's fallacy?
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The Bias: After five reds at roulette, why do people bet black?
They believe black is "due". Independent events have no memory. A famous 1913 Monte Carlo run saw black come up 26 times. Source: Wikipedia – Gambler's fallacy
Where It Shows Up: Where else?
Thinking a child "must" be a girl after several boys. Each event's odds stay the same. Source: Wikipedia – Gambler's fallacy
The Fix: Fix?
Ask whether the events are truly independent. If independent, the past tells you nothing. Source: Wikipedia – Gambler's fallacy