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Hi, I don't know where to start for this problem, or how to solve it, could someone please help?

 

How many -digit numbers are there, such that the sum of the digits is divisible by ?

 

Thanks!

 Mar 10, 2020
 #1
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I meant to write:

How many 10 digit numbers are there, such that the sum of the digits is divisible by 5?

 Mar 10, 2020

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