By using this site, you are accepting "session" cookies, as set out in the site's Privacy Policy
Cookies are also used to remember which page of the book you last viewed, so that when you revisit the site you automatically return to the last page you visited.
The question was, of course, rhetorical. You were supposed to answer: “no, there is nothing in the whole wide world that prevents our basing a number system on powers of some number other than 10.” So long as we agree on a number for the base of our number system, we may base the system on any number we please.