# [SOLVED] Null Sequence

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

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

I know that \$\displaystyle n^p/n!\$ is when \$\displaystyle 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 \$\displaystyle 1/n!\$ a basic null sequence?

I know that \$\displaystyle n^p/n!\$ is when \$\displaystyle 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 \$\displaystyle 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 \$\displaystyle 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 \$\displaystyle (-1)^n\$ part, not sure what made me ask!(Sleepy)(Doh)

Thanks for the other bit though!!