Question

Let S = {2,4,6} and T = {1,3,5}. Use the set-roster notation to write each of the following sets, and indicate the number of elements that are in each set?
a. S X T

b. T X S

c. S X S

d. T X T

Answer 1

Answer:

a. $S\times T=\{(2,1),(2,3),(2,5),(4,1),(4,3),(4,5),(6,1),(6,3),(6,5)\}$ . Set S × T has 9 elements.

b. $T\times S=\{(1,2),(1,4),(1,6),(3,2),(3,4),(3,6),(5,2),(5,4),(5,6)\}$. Set T × S has 9 elements.  

c. $S\times S=\{(2,2),(2,4),(2,6),(4,2),(4,4),(4,6),(6,2),(6,4),(6,6)\}$ . Set S × S has 9 elements.

d. $T\times T=\{(1,1),(1,3),(1,5),(3,1),(3,3),(3,5),(5,1),(5,3),(5,5)\}$ . Set T × T has 9 elements.

Step-by-step explanation:

The given sets are S={2,4,6} and T={1,3,5}.

We need to find the set-roster notation to write each of the following sets, and the number of elements that are in each set.

a.

$S\times T=\{(s,t)|s\in S and t\in T\}$

$S\times T=\{(2,1),(2,3),(2,5),(4,1),(4,3),(4,5),(6,1),(6,3),(6,5)\}$

Set S × T has 9 elements.

b.

$T\times S=\{(t,s)|s\in S and t\in T\}$

$T\times S=\{(1,2),(1,4),(1,6),(3,2),(3,4),(3,6),(5,2),(5,4),(5,6)\}$

Set T × S has 9 elements.  

c.

$S\times S=\{(s,s)|s\in S \}$

$S\times S=\{(2,2),(2,4),(2,6),(4,2),(4,4),(4,6),(6,2),(6,4),(6,6)\}$

Set S × S has 9 elements.

d.

$T\times T=\{(t,t)|t\in T\}$

$T\times T=\{(1,1),(1,3),(1,5),(3,1),(3,3),(3,5),(5,1),(5,3),(5,5)\}$

Set T × T has 9 elements.