How many different three-digit numbers can be formed with five number cards: 0, 2, 4, 6, 8.
用五张数字卡片：0，2，4，6，8能组成多少个不同的三位数．
<gadget id="calculator">4 * 4 * 3</gadget>
<output>48</output>

<result>48</result>