Question

Given A= {1, 3, 5, 7, 8, 9} and B= {2, 4, 7, 9}, solve the following

A or B =
B and A =

Is it just the same as A U B or A (upside down U) B? Thanks. :)

Answer 1

\(\large\rm A~or~B \quad \equiv\quad A\cup B\)
So which elements are in A, or in B?
{1, 2, 3, 4, 7, 8, 9}
All of these guys show in either the first or second set, ya? :)


\(\large\rm A~and~B\quad \equiv\quad A\cap B\)
Which elements are in A and in B?
Hmm I see a 7 in both of them. Any others?