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

$${Write}\:{the}\:{series},{indicating}\:{the} \\ $$$$\mathrm{5}{th}\:{term},{the}\:\mathrm{5}{th}\:{partial}\:{sum} \\ $$$$ \\ $$$$\mathrm{0}+\mathrm{1}+\mathrm{3}+…+\left(\frac{{n}^{\mathrm{2}} +{n}}{\mathrm{2}}\right)+… \\ $$

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