Of a population of 1,3,5 and a sample size of 2 with replacement. List all possible samples how do I do this?

So you need to pick 2 numbers since that is your sample size. On your first pick, you can select 1, 3 or 5. Then on your second pick you can still select 1, 3 or 5 since it says 'with replacement'. So your possible samples are the following:

1, 1
1, 3
1, 5
3, 1
3, 3
3, 5
5, 1
5, 3
5, 5

If the order of the 2 selections doesn't matter then 1, 3 would be the same as 3, 1.