1/4
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The probability of the coin flip being heads or tails is 100%.
3/7, but only if the coin is taken at random.
It does not. When the price of silver and other metals went up in the 1800's, someone game up with the idea of using a nickel/copper alloy for a new coin. This new coin was the Shield Nickel and was called a nickel, well because the metal nickel being in the coin.
The probability of tossing a coin and getting heads is 0.5
There is the probability of 1/2 if it is a fair coin. There is the probability of 1 if it is a double-headed coin. There is the probability of 0 if it is a double-tailed coin.