There are five number cards, namely 10, 8, 9, 11, and 12. If two cards are randomly drawn from these five cards, what is the probability that the sum of the sum is 20?
有五张数字卡片，分别是10，8，9，11，12，如果从这五张卡片中任意抽取两张，相加的和是20的可能性是多少．
<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>