## keelyjm 2 years ago Is my answer correct for this summation notation problem?

1. keelyjm

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

2. keelyjm

|dw:1363357894822:dw| Is this correct?

3. Kanwar245

wait, n has to start from 1 and not 0

4. keelyjm

The only choices are n=0

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

6. Kanwar245

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

7. keelyjm

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

8. Kanwar245

so the first two terms are positive?

9. keelyjm

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

yes thats better

11. keelyjm

Okay I was not so sure. Thank you!

12. Kanwar245

thats not correct

13. Kanwar245

the first term will be 0, lol!

14. terenzreignz

No it won't...

15. keelyjm

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

16. Kanwar245

the series you gave had the first term 3

17. keelyjm

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. Kanwar245

anything to the power of 0 is 1!

19. keelyjm

and the first term was -4

20. Kanwar245

yeah I wrote it in that way

21. Kanwar245

there are more ways to write it

22. Kanwar245

I hope you see it.

23. keelyjm

It depends on if it is finite or infinite

24. Kanwar245

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

25. Kanwar245

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