T[sub:5boe7kh7]n[/sub:5boe7kh7]=10+(n-1)6+the sum from i=1 to n-2 of i.
This sum is very simple, it's arithmetic.
The sum of an arithmetic series is (average value)(number of terms).
The average is (first+last)/2.
In this case, the average is (1+n-2)/2 =(n-1)/2 and there are n-2 terms.
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