what is the probability a 45 years old lives to the age of 90?

odds against men who are 45 years old, living till they are 90 is 9:2. what does it mean?
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It means that the probability of a 45-year old man not living to the age of 90 is 9/11 so the probability of living till 90 is 1-9/11=2/11. The ratio of these two probabilities is 9:2 against living to the age of 90.

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