Ten numbers from 1 to 10 are written on the 10 number cards, and the possibility of drawing a prime number is expressed in fractions
10张数字卡片上写着1-10十个数，抽到素数的可能性用分数表示是多少
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

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