Use number cards 1, 2, 3 and decimal points • How many decimals can be formed without repeating numbers.
用数字卡片1、2、3和小数点•能组成多少个没有重复数字的小数．
<gadget id="calculator">3 * 2 * 1 * 2</gadget>
<output>12</output>

<result>12</result>