1 in 4
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.5 or 1/2
As a coin has two sides, the odds are always 50-50.
The odds are 1 in 2.
The odds of flipping a coin and having it come up heads three times in a row is (1/2)*(1/2)*(1/2)=(1/8) or 12.5% ■
The probability of heads is 1/2.