Write ten natural numbers from 1 to 10 on 10 identical cards, put them upside down on the table after scrambling, and draw one of them at random. What is the probability of drawing a prime number?
把1～10这十个自然数分别写在10张同样的卡片上，打乱后反扣在桌上，从中任意抽出一张，抽到素数的可能性是多少
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>