# Number - Base (or Radix)

The radix or base 1) is the number of unique digits, including zero, used to represent numbers in a positional numeral system.

## Example

### Decimal

For the decimal system the radix is ten, because it uses ten digits:

• 0
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9

### Binary

For the binary system the radix is 2, because it uses only two digits:

• 0
• 1

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