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Sum Divisibility Dilemma (Posted on 2014-03-18) Difficulty: 3 of 5
Determine a general formula (in terms of n) for the sum of the first n positive integers that are not divisible by 5.

No Solution Yet Submitted by K Sengupta    
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re: Different formula, same result | Comment 3 of 6 |
(In reply to Different formula, same result by Steve Herman)

This is much more elegant than my solution, well done! 
  Posted by tomarken on 2014-03-18 13:40:47

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