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Clojure doesn’t have tail recursion due to limitations with the JVM so you have to explicitly use ‘recur’:

(defn factorial [n]
  (fact-iter 1 1 n))
(defn fact-iter [product counter max-count]
  (if (> counter max-count)
    product
    (recur (* counter product)
                (+ counter 1)
                max-count)))