A deck of 52 playing cards (no big king, little king), if you take any one card, what is the probability of getting a heart.
一副52张(无大王，小王)的扑克牌，任取一张，取到红桃的可能能性大小为多少．
<gadget id="calculator">13 / 52</gadget>
<output>1/4 = around 0.25</output>

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