olymmath

HMMT 2019 T2

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Let N={1,2,3,…}\mathbb{N}=\{1,2,3, \ldots\} be the set of all positive integers, and let ff be a bijection from N\mathbb{N} to N\mathbb{N}. Must there exist some positive integer nn such that (f(1),f(2),…,f(n))(f(1), f(2), \ldots, f(n)) is a permutation of (1,2,…,n)(1,2, \ldots, n) ?

Dataset text NuminaMath olympiads. Quoted with source.

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