PUMaC 2018 · 团队赛 · 第 1 题

PUMaC 2018 — Team Round — Problem 1

Let T = { a , a , . . . , a } , where a < a < . . . < a , be a uniformly randomly selected 1 2 1000 1 2 1000 subset of { 1 , 2 , . . . , 2018 } with cardinality 1000. The expected value of a can be written in 7 m reduced form as . Find m + n . n

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