# All the Digits

- Author:
- spkwan

- Topic:
- Arithmetic

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

## reference: NRICH

## 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

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