What is the probability that a card randomly drawn from among 100 cards with numbers 1 to 100 is exactly a prime number?
在写有1到100的100张卡片中随机抽取一张卡片正好是素数的可能性是多少．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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