we have that event A is that two-person both get an even number when a number between 1 and 10 is generated randomly. There are 5 even numbers between 1 and 10. The possible outcomes for this event are the following:
(2,2); (2,4); (2,6); (2,8); (2,10)
(4,2); (4,4); (4,6); (4,8); (4,10)
(6,2); (6,4); (6,6); (6,8); (6,10)
(8,2); (8,4); (8,6); (8,8); (8,10)
(10,2); (10,4); (10,6); (10,8), (10,10)
Therefore, there are 25 possible outcomes for this event.