HMMT November 2015 H8
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- Answer
Consider an grid of squares. A rook is placed in the lower left corner, and every minute it moves to a square in the same row or column with equal probability (the rook must move; i.e. it cannot stay in the same square). What is the expected number of minutes until the rook reaches the upper right corner?
Dataset text NuminaMath olympiads. Quoted with source.
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