How much is the comparability of randomly drawing black-core cards from 52 cards in a deck of poker (remove big and small kings).
一副扑克(去掉大、小王)，从52张扑克中任意抽出是黑核牌的可比性是多少．
<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>