I wasn't sure which section this belonged to so I decided to post it here.

I started it like this:Quote:

Use a method to approximate using a sequence of rational numbers. Do the same for

where L is the limit.

Both sequences must have the same limit:

Since we want L= :

Since we want this to be 0 a=b since the middle term cannot exist.

I want the positive so b=1.

Therefore the sequence becomes . This sequence tends to .

Using the same method to find one that tends to gives:

Once again, the central term cannot be present at the end so a=b:

But b can only be a rational number so it doesn't make sense. I think i'm supposed to use the first answer to find the second one except the two sequences are entirely different!

So am I on the right lines?