If the nine-digit number 153ABABAB is a multiple of 6, where A and B represent different numbers, how many such nine-digit numbers are there?
若九位数153ABABAB是6的倍数，其中A、B表示不同的数字，则这样的九位数有多少个．
<gadget id="calculator">5 * 9</gadget>
<output>45</output>

<result>45</result>