Summation question

  • #1
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
 

Answers and Replies

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