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For how many three-digit positive integers is the sum of the digits equal to 5?

 Apr 2, 2024
 #1
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For how many three-digit positive integers is the sum of the digits equal to 5?  

 

104      203      302      401      500  

113      212      311      410  

122      221      320  

131      230  

140  

 

If I didn't miss any, I get 15 of them.    

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 Apr 2, 2024

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