From a deck of playing cards (52 cards) with kings and kings removed, what is the probability of drawing a spade when one card is drawn?
从一副去掉大小王的扑克牌中(52张)，抽一张牌，抽到黑桃的可能性大小是多少．
<gadget id="calculator">54 - 2</gadget>
<output>52</output>

<gadget id="calculator">13 / 52</gadget>
<output>1/4 = around 0.25</output>

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