Clojure Brain Teasers: Typo in puzzle 17, page 70

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This code chunk is incorrect:

(inc 100) ;; 101
(- 101 80) ;; 20
(* 20 2) ;; 40

and should read:

(inc 100) ;; 101
(- 101 80) ;; 21
(* 21 2) ;; 42