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What is a digital root, and how is it useful in this chapter?


Ravindra Pindel 3rd Aug, 2020
Answer (1)
Ravindra Pindel 3rd Aug, 2020

A digital root is the single-digit value obtained by continuously summing the digits of a number.
Example: Digital root of 121 is 1 + 2 + 1 = 4

It is useful to check divisibility, especially for 3 and 9.

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