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Offline Злобный Ящур
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#1150
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Two people want to flip a coin, but they know the coin is "biased" – the probability of getting heads and tails is different. The question is – how can they flip a coin? Assume that the players do not know the exact values of the probabilities, it would take a long time and be difficult to find them, etc.
That is, they don't even know which side has a higher probability? Then it's simple. One flips the coin, but doesn't show the result to the other. The other chooses "heads" or "tails". If they guess correctly, they win; if not, they lose.

Added 4 minutes later

Ничто не возникает из ничего и ничто не пропадает бесследно.
Если где-то чего-то убудет, то в другом месте добавится.
(Закон сохранения).

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