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Omni-MATH / How many nondecreasing sequences a₁,a₂,…,a₁₀ are composed entirely of at most three distinct numbers from the set 1,2,…,9 (so 1,1,1,2,2,2,3,3,3,3 and 2,2,2,2,5,5,5,5,5,5 are both… · Discussion

Discussing How many nondecreasing sequences a₁,a₂,…,a₁₀ are composed entirely of at most three distinct numbers from the set {1,2,…,9} (so 1,1,1,2,2,2,3,3,3,3 and 2,2,2,2,5,5,5,5,5,5 are both… · Omni-MATH

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