1/2 Because there is one side with heads (1/) and the total sides (/2)
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The probability of a coin landing on heads is 0.5. It does not matter which toss it is, and it does not matter what the toss history was.
The probability of flipping Heads on a coin is 1 - a certainty - if the coin is flipped often enough. On a single toss of a fair coin the probability is 1/2.
Probability = 0.5
The probability is 0%. The result will be heads or it will be tails but it cannot be heads and tails.
The probability is 0.5 regardless how many times you toss the coin."