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Mathematical problem: Find the sum of all three digits in a natural sequence. How to do sum formula
The three digits in a natural number are the sum of 100-999***900 numbers, and their sum is:

s = 100+ 10 1+ 102+ 103...+997+998+999

=( 100+999)+( 10 1+998)+( 102+997)+...+(549+550)

= 1099×450

=494500

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