The digital root of a number is obtained by summing its digits and then repeating the process (summing the sum's digits) until the answer is a single digit number. For example, the digital root of 7368 is 6.

Determine the digital root of (9⁷²⁴⁰+38)⁸⁴⁵⁷

Before posting the solution to this problem, I would like to congratulate each of the members who solved this puzzle in a precise manner.
In particular, I must admit that I was quite taken aback by the solution posted by Daniel. It was quite surprising to find the precise synergy of logical conclusion and analytic methodologies culminating in an accurate solution to the puzzle under reference. 

 

Posted by K Sengupta on 2006-07-11 14:00:38