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All the Digits

Autor:spkwan

The whole calculation uses each of the digits 0-9 once and once only. How many solutions can you find?

reference: NRICH

https://nrich.maths.org/1129

Using each of the numbers 1 to 9 once and once only, find two numbers, one of which is double the other. How many solutions can you find?

reference: NRICH

https://nrich.maths.org/7182

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