There are two playing cards on the table, namely 4 of diamonds and 4 of spades. If one of them is randomly drawn, what is the probability of drawing 4 of spades?
桌面上有两张扑克牌，分别是方块4和黑桃4，随意摸取其中的一张，摸到黑桃4的可能性是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>