English ordinal numbers may function as either an adjective or as a noun, and almost never appear in the plural.
"seventy-fifth." YourDictionary, n.d. Web. 16 July 2019. <https://www.yourdictionary.com/seventy-fifth>.
seventy-fifth. (n.d.). Retrieved July 16th, 2019, from https://www.yourdictionary.com/seventy-fifth
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