090310 Exercise 1.12 Pascal's triangle

xiaoxiao2023-09-19 15

(define (Pascal x y) (cond ((> y x) (display "error input")) ((= x 1) 1) ((= x 2) 1) ((= y 1) 1) ((= x y) 1) (else (+ (Pascal(- x 1) y) (Pascal (- x 1) (- y 1)) ))))

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