Grouping of decimal numbers

• Given a lot of 4-digit numbers (0000 to 9999)

  • 10^4 = 10000 numbers altogether

• Can have 10^1 (10) groups of 10^3 (1000)

• Can have 10^2 (100) groups of 10^2 (100)

• Can have 10^3 (1000) groups of 10^1 (10)

• Can have 10^4 (10000) groups of 1

• Any large group can be divided into smaller groups, recursively

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