Each time you flip a fair coin it has the same equal chance of landing on heads or tails. That is, even if you get (for example) 19 heads in a row, the next flip still has 50% chance of landing on tails (if the coin is fair).
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The sample space when flipping a coin is [heads, tails].
If two events are independent of one another, then the outcome of one event does not depend on the outcome of the other event. Example is flipping of two coins. The second coin is not dependent on the outcome of the first flip. But if you want to know if the two coins are the same (either both heads or both tails), then that outcome is dependent on the first coin and the second coin.
Two possible outcomes for each flip. 2,048 possible histories of 11 flips.
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.