Maths Olympiad – Pigeonhole Principle
Posted July 12, 2016on:
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.