Death Probabilities with differing assumptions

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So I've just started delving into survival analysis and its varying assumptions with regards to the probabilities of dying.

A question that I have stumbled upon and would like some assistance if possible involves using the Uniform distribution of deaths, constant hazard, and the Balducci assumption.

If the probability that an individual lives from 100 years of age to 110 years of age, given that they make it to 100 is 1/1000, under each of the assumptions (UDD, constant hazard, Balducci), what proportion die on or after their 105th birthday and before their 110th birthday.

Any explanation would be great.