There are four number cards of 1, 2, 3, and 4. Randomly draw two of them to form a two-digit number. What is the probability that the two-digit number formed by the two drawn cards is less than 20?
有1、2、3、4四张数字卡片，从中任意抽取两张，然后组成两位数，抽取的两张卡片所组成的两位数小于20的可能性是多少．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>