Help with Sequence question??

Hi, i've revised arithmetic and geometric progression .. and currently stuck on this question

A sequence u1, u2, u3 is defined by

u1:3 and un+1: 1-1/un for n >1

Write down the value of u2, u3 and u4

Here is an image of the question (better to look here)

http://imageshack.us/photo/my-images/508/54721288.jpg/

I just don't get it, i looked in mymaths and can't it there :-(
and these type of question come up a lot!

Thanks

This series is given by a recursive form.
$u_{n+1}=1-\frac{1}{u_n}$
and
$u_1=3$

so
$u_{1+1}=u_2=1-\frac{1}{u_1}$
and
$u_3=1-\frac{1}{u2}$