Prove that every open interval that contains {1,2} must also contain 1.5. Please teach me how to prove it. Should I use a specific open interval or general open interval like (a,b)? Thank you.

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
ChapterP: Prerequisites
SectionP.2: Real Numbers
Problem 3E: Express the set of real numbers between but not including 2 and 7 as follows. (a) In set-builder...
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Prove that every open interval that contains {1,2} must also contain 1.5.

Please teach me how to prove it. Should I use a specific open interval or general open interval like (a,b)? Thank you.

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