olymmath

IrMO 2021 Problem 1

  • Paper 1

Let N=15!=15⋅14⋅13...3⋅2⋅1N = 15! = 15\cdot 14\cdot 13 ... 3\cdot 2\cdot 1 . Prove that NN can be written as a product of nine different integers all between 1616 and 3030 inclusive.

Dataset text AI-MO AoPS. Quoted with source.

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