Question 943756
first digit: 3 choices (1, 2, 3)
second digit: 5 choices (0, 1, 2, 3, 4)
third digit: 5 choices (0, 1, 2, 3, 4)
fourth digit: 5 choices (0, 1, 2, 3, 4)


total: 3 * 5^3 = 375 numbers