The odds of winning are 10,000,000,000, to 1.
If the odds are 9 to 7, the chance of winning is 43.75%
If the odds of a horse winning a horse race are 2 to 7 then the odds against that horse winning the race are 7 to 2.
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%
The odds of winning the Irish Lottery are 1 in 8,145,060 compare that to the odds of winning the Euromillions which are 1 in 76,275,360 so the Irish Lottery http://www.irishlottery.com/ attracts a lot of players as the odds of winning are much better.
Here are the two for comparison;For 3 to 1 odds of winning;Probability of winning:0.25, or;Chance of winning:25%---------------------For 9 to 1 odds of winning;Probability of winning:0.1, or;Chance of winning:10%
For 9 to 11 odds of winning;Probability of winning:0.55, or;Chance of winning:55%
For 2 to 1 odds of winning;Probability of winning:0.333333, or;Chance of winning:33.33%
Not easy:For 26 to 1 odds of winning;Probability of winning:0.037037, or;Chance of winning:3.7%
For 5 to 3 odds of winning; the probability of winning is 0.375 or 37.5%
If the odds are 179 to 2, the probability of winning is 0.01105, or; the chance of winning is 1.11%