How many even four digit numbers () A. 6B. 10C. 12D. 24

How many even four digit numbers () A. 6B. 10C. 12D. 24

When the last digit is 0, the first three digits are randomly arranged with A33 = 6. When the last digit is 2, the first digit can only be selected from 1 and 3, and then the middle two digits are arranged with A12 · A22 = 4. According to the principle of classification and counting, there are 6 + 4 = 10 even digits without repetition