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The letter "T"
If you toss them enough times, the probability is 1. For just one toss the probability is 1/4.
Usually a toss of a coin tossed by the referee and called by one of the team captains.
Knowing the results in advance, there is a 7/10 chance that the first toss is heads. In this case "seven out of ten" is quite literal. The first toss is one of the 10, and 7 of them came up heads, so 7/10 is the chance that this particular one is one of the heads.
you toss 3 coins what is the probability that you get exactly 2 heads given that you get at least one head?