How to get rid of duplicates in a list, but keep the order

Question

I am using Intermediate Student with Lambda in DrRacket, I was wondering how one would remove the duplicates in a list, while keeping the order. For example (remo

Answer 1

If your goal is to get the functionality working, and not some homework question, then you don't need to do anything, just use remove-duplicates:

Welcome to Racket v5.2.
-> (remove-duplicates (list 2 5 4 5 1 2))
'(2 5 4 1)