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4 points by skenney26 6097 days ago | link | parent

It looks like the final left paren in hyfac is misplaced. It needs to be before the call to fac. Also, unless you explicity return y, hyfac will just return nil.

  (def hyfac (n)
    (let y 1
      (for x 1 (+ n 1)
        (= y (* y (fac n))))
    y))