Question

If U={11,12,13,14,15,16,17,18,19,20} and A={12,13,14,20}, what is the complement of A ? a. {15,16,17,18,19} b. {11,15,16,17,18,19} c. {11,12,13,14,15,16,17,18,19,20} d. {12,13,14,20}

Answer 1

The complement of set A, denoted as A', contains all the elements that are in the universal set U but not in A.

U = {11, 12, 13, 14, 15, 16, 17, 18, 19, 20}
A = {12, 13, 14, 20}

To find the complement A', we need to list all the elements in U that are not in A:

A' = {11, 15, 16, 17, 18, 19}

So, the correct answer is option (b): {11, 15, 16, 17, 18, 19}.