Am I doing this right?

What is the sum of the geometric sequence -1, 6, -36, if there are 7 terms?

First term: -1
Common ratio: -30
N:

How do I find "n" again???

Question

Am I doing this right?

What is the sum of the geometric sequence -1, 6, -36, if there are 7 terms? 

First term: -1
Common ratio: -30
N: 

How do I find "n" again???

hartnn · Answer

n=number of terms =7

anonymous · Answer

oh really?  okay perfect thanks!!!!

hartnn · Answer

common ratio =-30 ???? :O 
thats incorrect -_-

anonymous · Answer

Common ratio..;;what hartnn said!

anonymous · Answer

the answer i got was wrong....

hartnn · Answer

common ratio = 6/(-1) = -36/6=.... ?

anonymous · Answer

omg i used the steps for the arthmetic sequence!!!!!!!!!!!

anonymous · Answer

= -6

hartnn · Answer

know the formula for the sum of the geometric sequence 
or should i mention it ?

anonymous · Answer

No but I'll write it down

hartnn · Answer

r=-6 , a1 =-1, n=7
are correct.

anonymous · Answer

ok:)

anonymous · Answer

wait how did you get a1 = -1?

hartnn · Answer

a1= 1st term
an =n'th term

anonymous · Answer

wait where does it state the n'th term??

anonymous · Answer

sorry for my foolish questions

hartnn · Answer

it doesn't , and you don't need it here.
just an extra info. here.

anonymous · Answer

i got my answer!!!!!! thank you soooooooooo much

hartnn · Answer

welcome ^_^