Monday, May 29, 2006

Post-Pre-U-Sem-Syndrome aka PPUSS

I'm finally back from Pre-U Sem! Was quite a bitter-sweet encounter - hellishly painful during the course of it, yet I'm overcome by nostalgia whenever I gaze upon this photo...

We'll probably never meet again, but I doubt any of us will ever forget this experience. I've learnt much.

And life goes on...

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Puzzle of the day from perplexus.info:
190 couples (Difficulty: 3 of 5)

The set S consists of 20 distinct positive integers, each below 70.

Create a set S' of 190 pairwise absolute values of differences between two distinct members of S.

Prove that in S' there must exist at least one value that appears more than 3 times.

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