Re: For the mathematically minded
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When people talk about probability problems involving coins they always mean fair coins unless they specify otherwise.
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I disagree on two levels. Some people (as RocketManJames points out) use "coin flip" to mean any binary outcome over which no one has any control or way of getting information other than doing it. Going all in heads-up preflop is a coin flip, the way many people use the term, but that doesn't mean the odds are even.
Second, even when people always mean something, it can be useful to point out the underlying assumptions.
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