Mathematics 1228A/B Study Guide - Midterm Guide: Stage Lighting, Combination Lock

• School: Western University
• Department: Mathematics
• Course: Mathematics 1228A/B
• Professor: All

Document Summary

[ 1 mark ] let a = {1, 2, 3}, b = {2, 4, 5} and c = {2, 3, 4, 6}. Solution: a b contains all elements that are in a or are in b (or both), so we have. A b = {1, 2, 3} {2, 4, 5} = {1, 2, 3, 4, 5} The intersection of this set with set c contains only those elements which are in both of the sets at the same time. C with the union of a and b contains every element of c except for the 6. ) [ 1 mark ] let e and f be subsets of u with n(u ) = 100, while n(e) = 24, n(e f c) = 4 and n(e f ) = 40. Solution: every element of e is either also in f or not also in f (and none is both) so we know that n(e) = n(e f ) + n(e f c).