# Sequences arithmetic, geometric or Reither

• Feb 24th 2008, 09:06 PM
Folklore
Sequences arithmetic, geometric or Reither
A little work on Sequences here but I'm unsure about a couple of my questions, here they are

1, -1, 1, -1, 1...

I'm thinking this would be a geometric sequences with (-1) as the ratio, would I be incorrect?
• Feb 24th 2008, 09:11 PM
mr fantastic
Quote:

Originally Posted by Folklore
A little work on Sequences here but I'm unsure about a couple of my questions, here they are

1, -1, 1, -1, 1...

I'm thinking this would be a geometric sequences with (-1) as the ratio, would I be incorrect?

No, you are NOT incorrect. You are CORRECT.
• Feb 24th 2008, 09:13 PM
Folklore
Quote:

Originally Posted by mr fantastic
No, you are NOT incorrect. You are CORRECT.

thanks very much cleared that up ^^

One more little thing, the first 5 terms of the sequence

Xk = 9k - 7

I have on my results here

X1 = 9k - 7 = 2

X2 = 9k - 7 = 11

X3 = 9k - 7 = 20

X4 = 9k - 7 = 29

X5 = 9k - 7 = 38

would this be correct ?