Find

what i did was:

i used to expand

but the suggested answer is ........

where did i go wrong?

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- Jun 24th 2010, 09:07 AMwintersolticesigma notation
Find

what i did was:

i used to expand

but the suggested answer is ........

where did i go wrong? - Jun 24th 2010, 09:22 AMred_dog
The sum has n-3 terms, not n terms.

- Jun 24th 2010, 09:30 AMwintersoltice
- Jun 24th 2010, 09:35 AMred_dog