If you want to look up the maths elsewhere, it may be helpful to know that a constant, independent chance of death (or survival) per year is modelled by a negative binomial distribution.
Yes, looking back at this, I should have just said that on average, if someone dies with a probability of 1/1000, then he will live 999 years and die in the 1000th. And then I should have linked him the “Expectation” section of the Wikipedia page of the negative binomial distribution.
If you want to look up the maths elsewhere, it may be helpful to know that a constant, independent chance of death (or survival) per year is modelled by a negative binomial distribution.
Yes, looking back at this, I should have just said that on average, if someone dies with a probability of 1/1000, then he will live 999 years and die in the 1000th. And then I should have linked him the “Expectation” section of the Wikipedia page of the negative binomial distribution.