olymmath

HMMT November 2021 U4

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Find the number of ways in which the letters in "HMMTHMMT" can be rearranged so that each letter is adjacent to another copy of the same letter. For example, "MMMMTTHH" satisfies this property, but "HHTMMMTM" does not.

Dataset text NuminaMath olympiads. Quoted with source.

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