## A community for students. Sign up today

Here's the question you clicked on:

## anonymous 3 years ago Is my answer correct for this summation notation problem?

• This Question is Closed
1. anonymous

Write the sum using summation notation, assuming the suggested pattern continues.1 - 3 + 9 - 27 + ...

2. anonymous

|dw:1363357894822:dw| Is this correct?

3. anonymous

wait, n has to start from 1 and not 0

4. anonymous

The only choices are n=0

5. anonymous

we shud notice that 1 is chanhing sign|dw:1363365221629:dw|

6. anonymous

can you rewrite the series, I think you have not written it correctly

7. anonymous

no that is what it says. I copied and pasted the question.

8. anonymous

so the first two terms are positive?

9. anonymous

No the first two terms are 1 and -3. Would this be better?|dw:1363358185671:dw|

10. anonymous

yes thats better

11. anonymous

Okay I was not so sure. Thank you!

12. anonymous

thats not correct

13. anonymous

the first term will be 0, lol!

14. terenzreignz

No it won't...

15. anonymous

not necessarily if you look at the summation question I asked before this.

16. anonymous

the series you gave had the first term 3

17. anonymous

Write the sum using summation notation, assuming the suggested pattern continues. -4 + 5 + 14 + 23 + ... + 131 and the answer was $\sum_{n=0}^{15}9n-4$

18. anonymous

anything to the power of 0 is 1!

19. anonymous

and the first term was -4

20. anonymous

yeah I wrote it in that way

21. anonymous

there are more ways to write it

22. anonymous

I hope you see it.

23. anonymous

It depends on if it is finite or infinite

24. anonymous

for example I could have written $\sum_{n=1}^{15}9(n-1)-4$

25. anonymous

and that works too!!!!!!!!

#### Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy