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Make an unfair coin fair

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Since a coin flip is a binary outcome, you can make an unfair coin fair by flipping it twice. If you flip it twice, there are two outcomes that you can bet on: heads followed by tails or tails followed by heads.

P(heads) * P(tails) = P(tails) * P(heads)

This makes sense since each coin toss is an independent event. This means that if you get heads ? heads or tails ? tails, you would need to reflip the coin.

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