There are 4 poker cards on the table, which are 3, 4, 5, and 6, and the backs are all facing up. How many three-digit numbers are there?
桌子上有4张扑克牌，分别是3、4、5、6，背面都朝上，摆出的三位数共有多少个．
<gadget id="calculator">4 * 3 * 2</gadget>
<output>24</output>

<result>24</result>