A total of 10 number cards from 1 to 10 are reversed on the table. If you touch any one, the probability of getting a prime number is ((())/(())).
桌上反扣1～10共10张数字卡片，任意摸一张，摸到质数的可能性是((())/(()))．
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

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