Answer:
{(2,2) , (2,7) , (2,5) , (3,2) , (3,7) , (3,5) , (8,2) , (8,7) , (8,5)}
Explanation:
Given : 
 Set A = (2 3 8) 
 Set B = (2 7 5)
Unknown: 
Product of two sets a x b;
Solution: 
Set A = (2 3 8) 
 Set B = (2 7 5)
 The cartesian product of two sets is expressed as the order pairs of elements from A to B;
A = (2 3 8) 
B = (2 7 5)
 A x B = {(2,2) , (2,7) , (2,5) , (3,2) , (3,7) , (3,5) , (8,2) , (8,7) , (8,5)}