Write-the-series-indicating-the-5th-term-the-5th-partial-sum-0-1-3-n-2-n-2-

Question Number 27688 by NECx last updated on 12/Jan/18

W r i t e t h e s e r i e s, i n d i c a t i n g t h e

5 t h t e r m, t h e 5 t h p a r t i a l s u m

0 + 1 + 3 + \dots + (\frac{n^{2} + n}{2}) + \dots