2. Write all two-digit numbers that can be written using the digits 3, 4, and 9. How many such numbers are there?
2. The sought numbers are $33,34,43,39,93,44,49,94,99$.

5 POINTS

There are 9 of these numbers.

Note: For writing 1 or 2 numbers, award 1 point, for 3 or 4 award 2 points, for 5 or 6 award 3 points, for 7 or 8 award 4 points, and for all 9 award 5 points. Grade the answer separately.