The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 9917.
9917 has 4 digits. The digits in 9917 are 9, 9, 1, and 7.
When you are asking for the sum of the digits of 9917, you are basically asking what is
9 plus 9 plus 1 plus 7?
Therefore, the sum of the digits in 9917 is as follows:
9 + 9 + 1 + 7 = 26
Sum of digits in 9918
See if you can calculate the sum of the digits in the next number on our list before you go here.
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