Question

Write the usefulness of Digits sums

Answer 1

Answer:

Digit sums and digital roots can be used for quick divisibility tests: a natural number is divisible by 3 or 9 if and only if its digit sum (or digital root) is divisible by 3 or 9, respectively. ... Digit sums are also a common ingredient in checksum algorithms to check the arithmetic operations of early computers.

Answer 2

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