— Poorly Drawn Lines

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(defun factorial (n)
  (labels
      ((f-iter (m acc)
         (cond ((= m 0) acc)
               ('t (f-iter (1- m)
                           (* m acc))))))
    (f-iter n 1)))

(defun binomial (n r)
  (labels
      ((b-iter (m acc)
         (cond ((< m (1+ (- n r))) acc)
               ('t (b-iter (1- m)
                           (* m acc))))))
    (/ (b-iter n 1) (factorial r))))

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— Me@2023-08-26 11:27:59 AM

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2023.08.27 Sunday (c) All rights reserved by ACHK