As Steve said, better look at the combinatorics-api.
As for your original code, the idea you have gives all permutations
not combinations! Few changes will make it functioning -
(defn permutations [n coll]
(if (= n 1)
(map #(vector %) coll)
(for [el coll nlis (permutations (- n 1) (k-filter el coll))]
(conj nlis el))))
Thanks
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