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sum of the digits

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How many numbers from the set have the sum of its digits equal to 2? 2019-10-24
Marcel pose la question :
Hello. My question is the following: Given the set {1,2...........10exp2019}, how many numbers from the set have the sum of its digits equal to 2?
I got some of them : 2 20 200 2000 20000 .......2. 10exp2018 11 110 1100 11000 110000....101 1010 10100 101000 1010000....10011 10010 100100 1001000 1010000.....10001 100010 1000100 10001000,,,,,,100001 1000010 10000100....... My problem is that I have difficulty in finding a strategy to obtain the exact quantity of numbers.
Please help me, thanks

Penny Nom lui répond.
The sum of the digits of two-digit number is 9 2008-07-01
Audrey pose la question :
the sum of the digits of two-digit number is 9. if the digits are reversed, the new number if 63 greater than the original number. find the number.
Penny Nom lui répond.
111...111 * 2003 2008-06-23
Peggy pose la question :
Number a = 111...111 formed by 2003 1's. Find the sum of the digits of the number 2003 * a.
Penny Nom lui répond.
The sum of the digits of a number 2008-06-23
Ben pose la question :
Question: Using mathematical induction, prove that if the sum of the digits of a number is divisible by three, then the number itself is also divisible by 3.
Penny Nom lui répond.
The sum of the digits of 2^100 2005-06-11
Richard pose la question :
The sum of the digits was calculated for the number 2100, then the sum of the digits was calculated for the resulting number and so on, until a single digit is left.
Penny Nom lui répond.
 
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