(adsbygoogle = window.adsbygoogle || []).push({}); Series and "Sigma" Notation

I have been revising over the sigma/sequences and series chapters, this is the second question now where i have had different answers to the book - yet- my answers seem to work - i think....

The question :

Write in [tex]\sum[/tex] notation

1 - 2 + 4 - 8 + 16 - 32

My answer is:

[tex]\sum_{0}^5 -2^r[/tex]

Is this correct?

Thie answer in the book by the way is:

[tex]\sum_{1}^6 (-1)^{r+1} \ 2r^{r-1}[/tex]

Regards,

Mo

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# Homework Help: Series and Sigma Notation

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