There are ten number cards from 1 to 10 in an opaque pocket. If you touch any one of them, what is the probability of getting a composite number?
在一个不透明的口袋里放有1至10十张数字卡片，从中任意摸一张，摸到合数的可能性是多少．
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

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