I have no idea how to solve this

20

∑ (i^3 + 3i^2 + 2i)

i=1

find the sum

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- April 18th 2009, 07:43 PM #1

- Joined
- Apr 2009
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- April 18th 2009, 07:53 PM #2
and each of the summations can be calculated using well known formulae eg. see here Some special sums