Type the correct answer in each box.
There are three letter tiles—A, B, and C—in a bag; and there are three number tiles—1, 2, and 3—in another bag. Alexis picks a letter tile, and then she picks a number tile. Complete the table representing the sample space for this situation.
Letter Tile
A B C
Number Tile
1

A-1 B-1 C-1
2

A-2
C-2
3

A-3 B-3

The sample size of the event is
.