Hi,
To make a page publicly available you need to turn on Anonymous Access. See this page for information on how to do this.
Well the question is about a page. If you only want to make individual pages public, you have to make the entire space viewable by Anonymous access; then restrict the access for pages you don't want people to see (a real pain). So the easiest is to just create a public space viewable by all to hold those pages.
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