Art, Music, and Creative Writing homework help. (chapter 6.3) : http://fit.ac.ir/en/download/ebooksclub.org__Discrete_Mathematics_with_Applications.pdf – 4th Ed.Exercise 7 on page 372 of the textbook (chapter 6.3). Question: Prove each statement that is true and find acounterexample for each statement that is false. Assume all setsare subsets of a universal set U.For all sets A, B, and C, (A ? B) ? (C ? B) = A ? (B ? C).Question: 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.