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One day, Alexis decides to write down all the numbers from 1 to 999 inclusive.

What is the sum of all the digits that Alexis wrote down?

 Jan 25, 2020
 #1
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The sum of the digits is 50500.

 Jan 25, 2020
 #2
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Total Sum = 13,500
Total Num = 2889 digits.

 Jan 25, 2020
 #3
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It is just an AP

s=999/2(1+999) = 999*500 = 499500

 Jan 26, 2020

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