Question 647896
{ 1, 3, 5, 7 } ∩ { 2, 4, 6, 8 } ={} (empty set, its size or cardinality (count of elements in a set) is zero)

explanation:

The intersection is {{{only}}} the {{{common}}} elements.

 To find the intersection of these two sets, we need to find out what elements they have in common. 

The numbers { 1, 3, 5, 7 } are elements of one set, and { 2, 4, 6, 8 } are elements of other set. As you can see, there is no {{{common}}} elements except empty set , therefore the intersections of these two sets is {}.(empty set)

Recall, the empty set {{{is}}} {{{included}}} in {{{any}}} set, it is also included in these sets although you don't see it.

Therefore, the empty set is the only thing set { 1, 3, 5, 7 } and set { 2, 4, 6, 8 } have in common.