If you mean like a coin toss, it's 50% probability of winning, also known as even or 1:1 odds.
Winning once has a probability of p=0.5. Winning twice has a probability of p*p = p^2 = 0.25 = 25% = 1/4 = "1 chance in 4" = "odds of 3 to 1 against."
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For 2 to 25 odds of winning;Probability of winning:0.925926, or;Chance of winning:92.59%
For 2 to 39 odds of winning;Probability of winning:0.95122, or;Chance of winning:95.12%
For 9 to 11 odds of winning;Probability of winning:0.55, or;Chance of winning:55%
Not very good:For 50 to 1 odds of winning;Probability of winning:0.019608, or;Chance of winning:1.96%
you have a 1/15 chance to win. or you could say a 6.66 % chance.