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Another mind-reading math trick! You can say what digit of a number the person scored out, only given what the other digits add up to. Why does it work? What’s special about the number 48?

Another mind-reading math trick! You can say what digit of a number the person scored out, only given what the other digits add up to. Why does it work? What’s special about the number 48?

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Matt Henderson

I post original stuff about maths, space, computational linguistics and other things that I like. This blog is meant to be accessible and interesting to people of all backgrounds. My undergrad was maths in Cambridge, and I'm now starting research in Speech and Language technology. Email me at If you're new, check out this overview of my posts. All code posted is in Mathematica.

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