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'Spot Thirteen' printed from http://nrich.maths.org/

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On the grid below, choose $13$ spots by clicking on them.

You will see that as you click more spots, your score changes.

Can you work out how the scoring system works?  We would love to hear what you did in order to test out your ideas.

Which spots should you choose to produce the maximum possible score?  How do you know that this is the maximum?

 

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