[SOLVED] Null Sequence

**Ian1779** · September 14th 2008, 01:30 PM

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!!

**Jhevon** · September 14th 2008, 01:33 PM

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

**Ian1779** · September 14th 2008, 01:46 PM

Thanks - I wasn't totally sure!

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

**Jhevon** · September 14th 2008, 01:53 PM

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?

**Ian1779** · September 14th 2008, 10:07 PM

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!

Thanks for the other bit though!!

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