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.
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.