extbook: https://www.google.com/search?

extbook: https://www.google.com/search?tbo=p&tbm=bks&q=isbn:0495391328

Textbook: http://fit.ac.ir/en/download/ebooksclub.org__Discrete_Mathematics_with_Applications.pdf

Exercise 7 on page 372 of the textbook (chapter 6.3). Also, find sets A, B, C such that one of the following two sets is a proper subset of the other: Ac ∩ (B ∩ C)c and B△C.

7. For all sets A, B, and C,(A − B) ∩ (C − B) = A − (B ∪ C).