There are 7 bottles of the same drink. One of the bottles has expired. If you take a bottle from it now, what is the probability that it will not expire?
有7瓶相同的饮料．其中一瓶过期了，现在从中任取一瓶，取得没过期的可能性是多少．
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<result>6/7 = around 0.857143</result>