1. Jan 9, 2016 #1

   NameIsUnique

   

   I know n(n+1)/2 solves from 1.... n by 1's
   
   Is there a formula where you can add up by 3's?
   
   Example: 3 + 6 + 9 + 12 ... n

    

   NameIsUnique, Jan 9, 2016
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3. Jan 9, 2016 #2

   Samy_A

   

   Science Advisor

   Homework Helper

   Hint: 3+6+9+12=3(1+2+3+4)

    

   Samy_A, Jan 9, 2016

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