Set A = |{ { A, B, }, {5,1 }, {1,3,5 }, { 3}, { 2,3} }|.  How many elements are in this set?

Given A={-4,0,11}, which elements of set are less than -1?

Let U = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, A = {2, 3, 4, 5, 6}, and B = {0, 3, 6, 9}. Find A NB.

Let A = {2, 3, 5, 6, 8} , B = {2, 6, 7, 8} С %3 (0, 1, 2, 4, 5, 7}. List the elements of the following sets. If there is more than one element write them separated by commas. AnB = { } AUB = { (BU C)NA = { BU (Cn A) = { }