High school math compulsory 3, what is the probability that a coin will be reversed after being tossed 0 times?
If the coin is uniform, the probability of heads up is the same as that of tails up, which is equal to 1/2.
If the coin is uneven, the probability of heads up is different from that of tails up. How much depends on the texture of the coin. However, the sum of the probability in positive direction and the probability in negative direction = 1.