1/2. There is an equal chance of the coin falling head up or tail up.
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Probability of getting a head or tail is not equal
The probability is 50-50.
It is 3/8.
The probability of getting a head or a tail is, for all practical purposes, equal to 1. The only other possibility is that the coin stands on its edge - technically possible but so very unlikely that it can safely be ignored.
It is (1/2)*(1/6) = 1/12