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

Sunday, 28 July 2013

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

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.

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