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B1 中级 韩语 2:52 Educational

X+Y (Clip) - Nathan solves math problem | Pinnacle Films

Pinnacle Films · 48,559,528 次观看 · 添加于 2 个月前

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B1

CEFR 等级

5/10

难度

字幕 (6 片段)

00:00

20 random cards are placed in a row, all face down.

00:05

A move consists of turning a face down card face up and turning over the card immediately to the right.

00:15

Show that no matter what the choice of cards to turn, this sequence of moves must terminate.

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