Shuffle the nine cards 2-10 and place them on the table, draw a card randomly, what is the probability of getting a composite number
把2-10这九张牌打乱反扣在桌上，任意摸一张牌，摸到合数的可能性是多少
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>