# [SOLVED] Null Sequence

• Sep 14th 2008, 01:30 PM
Ian1779
[SOLVED] Null Sequence
Hi

Very small question. Is $1/n!$ a basic null sequence?

I know that $n^p/n!$ is when $p>0$ but not sure about the first one.

Just looking for some clarification

Thanks!!
• Sep 14th 2008, 01:33 PM
Jhevon
Quote:

Originally Posted by Ian1779
Hi

Very small question. Is $1/n!$ a basic null sequence?

I know that $n^p/n!$ is when $p>0$ but not sure about the first one.

Just looking for some clarification

Thanks!!

yes it is. even 1/n will suffice
• Sep 14th 2008, 01:46 PM
Ian1779
Thanks - I wasn't totally sure!

One final one. Will $1/(-1)^n$ be a null sequence?
• Sep 14th 2008, 01:53 PM
Jhevon
Quote:

Originally Posted by Ian1779
Thanks - I wasn't totally sure!

One final one. Will $1/(-1)^n$ be a null sequence?

no

you know what a null sequence is, right? (Smirk)
• Sep 14th 2008, 10:07 PM
Ian1779
Yeah. I asked this last night ( was feeling a bit tired and not with it). I did know it can't be a null sequence because of the $(-1)^n$ part, not sure what made me ask!(Sleepy)(Doh)

Thanks for the other bit though!!