Question 15273
Let's count them:


First the units digit equal to 3:
13, 23, (NOT 33 since it has two digits equal to 3), 43, 53, 63, 73, 83, 93


Next, the ten's digit equal to 3:
30, 31, 32, 34, 35, 36, 37, 38, 39


Total equals 8 + 9 = 17


R^2 at SCC