# Determining a null sequence

• Mar 12th 2013, 09:13 AM
jennybee
Determining a null sequence
I'm trying to see if (5n^5) / (n^3) is null.

I know I need to use the combination rules to work it down to a basic null sequence, like {1/n} etc.

I don't know which rule to apply and at what stage
(Crying)
• Mar 12th 2013, 09:30 AM
Plato
Re: Determining a null sequence
Quote:

Originally Posted by jennybee
I'm trying to see if (5n^5) / (n^3) is null.

I know I need to use the combination rules to work it down to a basic null sequence, like {1/n} etc.

I don't know which rule to apply and at what stage

That is impossible to do because it is not true:
$\left(\frac{5n^5}{n^3}\right)=5n^2$
• Mar 12th 2013, 09:51 AM
jennybee
Re: Determining a null sequence
That'll explain why I couldn't do it. Thank you :)