Question

If you know union and intersection of intervals, please help.

Answer 1

the union of two sets of numbers is nothing more than the combination of all these 2 sets,

To fnind the union of E and F, we will join these 2 sets

E represents the numbers greater than 4, including 4

F represents the numbers ess than 6, not including 6

The union is represent by,

$E\cup F=(-\propto,6)\cup\lbrack4,\propto)$

Now, the intersection of two sets of numbers is the common number of the sets

In this case we don't have common numbers, so

$E\cap F=\emptyset$