Question

If A={A,15,E,17,18, B,20} and B={ X,22, F,42, Y,62,72}, then what is n(A∪B)?

Answer 1

14

Explanation:

There are 7 elements in each set, and no elements are shared. The number of elements in the union of the sets is then ...

n(A∪B) = 7+7 = 14