olymmath

HMMT November 2011 U12

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Joe has written 5 questions of different difficulties for a test with problems numbered 1 though 5 . He wants to make sure that problem ii is harder than problem jj whenever i−j≥3i-j \geq 3. In how many ways can he order the problems for his test?

Dataset text NuminaMath olympiads. Quoted with source.

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25

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