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Is my answer correct for this summation notation problem?

Mathematics
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Write the sum using summation notation, assuming the suggested pattern continues.1 - 3 + 9 - 27 + ...
|dw:1363357894822:dw| Is this correct?
wait, n has to start from 1 and not 0

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Other answers:

The only choices are n=0
we shud notice that 1 is chanhing sign|dw:1363365221629:dw|
can you rewrite the series, I think you have not written it correctly
no that is what it says. I copied and pasted the question.
so the first two terms are positive?
No the first two terms are 1 and -3. Would this be better?|dw:1363358185671:dw|
yes thats better
Okay I was not so sure. Thank you!
thats not correct
the first term will be 0, lol!
No it won't...
not necessarily if you look at the summation question I asked before this.
the series you gave had the first term 3
Write the sum using summation notation, assuming the suggested pattern continues. -4 + 5 + 14 + 23 + ... + 131 and the answer was \[\sum_{n=0}^{15}9n-4\]
anything to the power of 0 is 1!
and the first term was -4
yeah I wrote it in that way
there are more ways to write it
I hope you see it.
It depends on if it is finite or infinite
for example I could have written \[\sum_{n=1}^{15}9(n-1)-4\]
and that works too!!!!!!!!

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