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'Weekly Challenge 30: the Sign of the Times' printed from http://nrich.maths.org/

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This is the live weekly challenge. Our solution to this weekly challenge will appear sometime next Monday, when the next weekly challenge will appear.

We don't publish user solutions for the weekly challenges in the same way as we do for the main problems on the site, but please do discuss the weekly challenges on the Ask NRICH -- follow the link from the main part of the challenge.

Sometimes fascinating extensions and explorations will arise from the challenges. Why not share your thoughts, questions and findings on the Ask NRICH thread?

We hope that you enjoy the challenges.

If you have any comments please email Steve Hewson at post16.nrich@maths.org.