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X+Y (Clip) - Nathan solves math problem | Pinnacle Films
学习统计
CEFR 等级
难度
字幕 (6 片段)
20 random cards are placed in a row, all face down.
A move consists of turning a face down card face up and turning over the card immediately to the right.
Show that no matter what the choice of cards to turn, this sequence of moves must terminate.
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