Another solution, this time using Clojure's tail recursion:
(defn sum2 [func incr a b]
(loop [accum 0
x a]
(if (> x b)
accum
(recur (+ (func x) accum) (incr x)))))
This may be getting ahead of where you are now, so come back and look
when you've covered map, reduce, and tail recursion!
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