Question: ML/SML recursive function 13. Write a function isfact to determine if a positive integer is a factorial number. Do not use any formula. Please use

ML/SML recursive function

ML/SML recursive function 13. Write a function isfact to determine if a

13. Write a function isfact to determine if a positive integer is a factorial number. Do not use any formula. Please use let-in-end syntax in pattern style. isfact(120) true 13. Write a function isfact to determine if a positive integer is a factorial number. Do not use any formula. Please use let-in-end syntax in pattern style. isfact(120) true

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