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.
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The probability of tossing a coin and getting heads is 0.5
The probability is 0.998
on one coin, the probability of getting a head is 0.5, if there is no bias
It is 6*2-6 = 1/64 or 0.09375
Probability of getting a head or tail is not equal