Macro to generate all possible permutations of 'n choose k' binomial expansion

Have seen variations of this question posted around the web, but nothing that answers my question specifically.

I want to generate all possible permutations of an n choose k system, where the order of the numbers matters, as they will be coordinates. I feel like this should be relatively simple, given that there is a built in fucntion on excel to find the number of combinations from such a scenario.

So far all I can think of is to make a column of all possible n values, from which you could choose the three values (x,y,z) that I need, but I don't know how to code this. Thanks