50% probablility, or 1/2, that is, a one in two chance.
There is an equal chance that the coin will land either heads or tails.
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The probability of tossing a coin twice and getting tails both times is 1 in 4, or 25%. If you have already tossed a coin and had it land on tails, the probability that it will land on tails again the next time you toss it is 50%.
Since it is a certainty that a coin must land on either heads or tails, the probability must be 1.
The probability of two tails on two tosses of a coin is 0.52, or 0.25.
50%
The probability of getting two tails when tossing a coin is zero, because the coin can only have one result. If, one the other hand, you toss the coin twice, then the probability of getting two tails is 0.25, i.e. the probability of one tail, 0.5, squared.