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

Friday, 3 May 2019

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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