[Rails] increment?

Hi

I am wondering if anyone can assist with this:

I have two models, one is task and the other is examples. I have
developed an application that once you create a new task you are given
5 example fields.

What I need is when a user wants to create a new task, he/she is given
a list of five unique numbers. They can give their examples to each
of these numbers, so:
1 example1
2 example 2
3 ...
4
5

When the next task (task 2) is created, the unique numbers are
incremented so it will be

6 example xx
7 ...
8
9
10

Can anyone assist into how I can do this operation.

thanks
Mark

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