How do you give someone n options from A or B?

Question

I have a list A and a list B, and I want someone to be able to choose n from the cumulative list formed by combining A and B. However, my initial attempts were subpar at best:

You get n of your choice from list A and list B

I read this as you get n from A and n from B

You get n of your choice from list A or list B

I read this as you decide either A or B, and then choose n from it.

How do you correctly word my request?

Answer 1

All you need is:

Pick N from any of A or B.

Make N selections from any of A or B.

You need the word any in there.

Answer 2

To remove all doubt at the risk of being slightly redundant, you can say "select a total of n from among A and B.