keelyjm
Is my answer correct for this summation notation problem?
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keelyjm
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Write the sum using summation notation, assuming the suggested pattern continues.1 - 3 + 9 - 27 + ...
keelyjm
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|dw:1363357894822:dw|
Is this correct?
Kanwar245
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wait, n has to start from 1 and not 0
keelyjm
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The only choices are n=0
Jonask
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we shud notice that 1 is chanhing sign|dw:1363365221629:dw|
Kanwar245
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can you rewrite the series, I think you have not written it correctly
keelyjm
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no that is what it says. I copied and pasted the question.
Kanwar245
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so the first two terms are positive?
keelyjm
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No the first two terms are 1 and -3. Would this be better?|dw:1363358185671:dw|
Jonask
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yes thats better
keelyjm
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Okay I was not so sure. Thank you!
Kanwar245
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thats not correct
Kanwar245
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the first term will be 0, lol!
terenzreignz
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No it won't...
keelyjm
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not necessarily if you look at the summation question I asked before this.
Kanwar245
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the series you gave had the first term 3
keelyjm
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Write the sum using summation notation, assuming the suggested pattern continues.
-4 + 5 + 14 + 23 + ... + 131
and the answer was \[\sum_{n=0}^{15}9n-4\]
Kanwar245
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anything to the power of 0 is 1!
keelyjm
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and the first term was -4
Kanwar245
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yeah I wrote it in that way
Kanwar245
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there are more ways to write it
Kanwar245
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I hope you see it.
keelyjm
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It depends on if it is finite or infinite
Kanwar245
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for example I could have written
\[\sum_{n=1}^{15}9(n-1)-4\]
Kanwar245
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and that works too!!!!!!!!