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| sum of digit https://forumdematematica.org/viewtopic.php?f=71&t=145 |
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| Autor: | kinu [ 20 jan 2012, 13:08 ] |
| Título da Pergunta: | sum of digit |
Let \(S = \left\{20,21,22,23,.....210\right\}\).Consider all positive differences of elements of \(S\). If \(M\) is the Sum of all these differences,find the Sum of the digits of \(M\) |
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| Autor: | Sobolev [ 21 jan 2013, 12:54 ] |
| Título da Pergunta: | Re: sum of digit |
The difference between elements of S can be any number between 1 and 189. Computing explicitly their sum, M, and addind up the digits of M, we get 27. |
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