There are four playing cards 2, 5, 8, and 9, and three of them are drawn to form a three-digit number. How many double numbers are there in the different three-digit numbers formed?
有2、5、8、9四张扑克牌，从中抽出三张组成一个三位数，所拼成的不同三位数中双数有多少个．
<gadget id="calculator">2 * 3 * 2</gadget>
<output>12</output>

<result>12</result>