The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 8401.
8401 has 4 digits. The digits in 8401 are 8, 4, 0, and 1.
When you are asking for the sum of the digits of 8401, you are basically asking what is
8 plus 4 plus 0 plus 1?
Therefore, the sum of the digits in 8401 is as follows:
8 + 4 + 0 + 1 = 13
Sum of digits in 8402
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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