1. Suppose A, B and C are sets. Prove that (A \ B) U (A\ C) = A\ (Bn C). [Prove this using elements of these sets – no Venn diagrams!]

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.2: Mappings
Problem 22E
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1. Suppose A, B and C are sets. Prove that
(A\ B) U (A\ C) = A\ (Bn C).
[Prove this using elements of these sets – no Venn diagrams!]
2. Find sets A, B, C, D such that the sets
(An B) U (C\ D), ((An B) U C) \ D, An(BU C) \ D, An(BU(C\ D))
(+)
are all different. (Justify your answer by saying exactly what the four sets in (-) are.)
3. Suppose a, n e Z and 0 < a < n. Prove that
O-(".")-C)
1
+
а- 1
=
a
in two different ways: firstly using the formula for
in terms of factorials; and secondly by consid-
ering subsets of {1,..., n}.
Transcribed Image Text:1. Suppose A, B and C are sets. Prove that (A\ B) U (A\ C) = A\ (Bn C). [Prove this using elements of these sets – no Venn diagrams!] 2. Find sets A, B, C, D such that the sets (An B) U (C\ D), ((An B) U C) \ D, An(BU C) \ D, An(BU(C\ D)) (+) are all different. (Justify your answer by saying exactly what the four sets in (-) are.) 3. Suppose a, n e Z and 0 < a < n. Prove that O-(".")-C) 1 + а- 1 = a in two different ways: firstly using the formula for in terms of factorials; and secondly by consid- ering subsets of {1,..., n}.
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