3
$\begingroup$

Possible Duplicate:
Proof for formula for sum of sequence 1+2+3+…+n?

Can you explain this please $$T(n) = (n-1)+(n-2)+…1= \frac{(n-1)n}{2}$$

I am really bad at maths but need to understand this for software engineering.

  • 2
    What is it you are trying to understand?2011-11-10
  • 0
    just to explain this, what is the answer, how did you get it etc, what is this used for.2011-11-10
  • 0
    See [this](http://math.stackexchange.com/questions/60578).2011-11-10
  • 2
    @java: The answer to what? This is an equation, not a question.2011-11-10

5 Answers 5