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Find the number of 10-digit numbers, where the sum of the digits is divisible by \(15\)

 May 16, 2022
 #1
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This problem is solved here: https://web2.0calc.com/questions/counting-problem_147

 May 16, 2022
 #2
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10 - 99 : 4
100 - 999 : 69
1000 - 9999 : 603
10000 - 99999 : 5817
100000 - 999999 : 60378
1000000 - 9999999 : 602133
10000000 - 99999999 : 5987904
100000000 - 999999999 : 59994303
1000000000 - 9999999999 : 600225342

 

It is the last sum that you want ==600,225,342

 May 16, 2022

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