It is 0.5
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The probability of the coin flip being heads or tails is 100%.
There are two sides to the coin, so the probability of getting heads or tails on one flip of the coin is 1/2 or 50%.
unlikley
The probability that a single coin flip will come up heads is 0.5.
There is the probability of 1/2 if it is a fair coin. There is the probability of 1 if it is a double-headed coin. There is the probability of 0 if it is a double-tailed coin.