There are 1, 2, 3, 4, four number cards, how many different three-digit odd numbers can be formed by drawing three of them.
有1、2、3、4，四张数卡，从中抽取三张，能组成多少个不同的三位单数．
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>