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*Optional problem for extra credit:* \[50 pts\] The fibonacci function fib is defined by the following rules (in Scheme notation): |
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(fib 0) = 0 ;; formerly (fib 0) = 1; revised to match the prevailing mathematical conventions for defining fib (fib 1) = 1 (fib (+ n 1)) = (+ (fib n) (fib (- n 1))) |
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