Mizzi: h,2h-k,3h-2k,.....until 15 first term
I assume you want to find the sum to 15 term.
Hi mizzi,
You have 2 series here
the first is h, 2h, 3h, .......15h
the second is 0, -k, -2k, ..........-14k
you find the sum of the first series and find the sum of the second series (using the formulas). Then add the two answers together.
+118654 
