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Maths Olympiad – Pigeonhole Principle

Posted on: July 12, 2016

Here is a nice intro to this topic “Pigeonhole Principle” (in Chinese: 抽屉原理)

Applying the principle / formula is not hard, the most difficult part when solving this kind of problems, is identifying the ‘pigeonhole’ / ‘drawers’.

Here is some exercises to practise.

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