Geometric series

  • #1
Femme_physics
Gold Member
2,547
1

Homework Statement



You must enter 3 numbers between 31 and 496 so there will be an increasing geometric series with 5 components.


The Attempt at a Solution



It tells me I'm off. That q=2. But how?

http://img716.imageshack.us/img716/8895/300xk.jpg [Broken]
 
Last edited by a moderator:

Answers and Replies

  • #2
I like Serena
Homework Helper
6,577
176
Hey FP :)

Multiply instead of add?
 
  • #3
vela
Staff Emeritus
Science Advisor
Homework Helper
Education Advisor
15,049
1,636
With a geometric series, you multiply by q to get successive terms:

[tex]\begin{align*}
a_2 & = a_1 q \\
a_3 & = a_1 q^2 \\
a_4 & = a_1 q^3 \\
a_5 & = a_1 q^4
\end{align*}[/tex]

Do you see your mistake now?
 
  • #4
Femme_physics
Gold Member
2,547
1
Hey FP :)

Multiply instead of add?


w00t! :) I hope I have all the formulas at the test so I can relook them. Thanks, ILS! And vela, too :)
 

Related Threads on Geometric series

Replies
2
Views
5K
  • Last Post
Replies
4
Views
5K
  • Last Post
Replies
7
Views
1K
  • Last Post
Replies
13
Views
4K
  • Last Post
Replies
0
Views
2K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
9
Views
3K
  • Last Post
Replies
11
Views
2K
  • Last Post
Replies
2
Views
2K
Top