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Gaokao Math Practice Question

某公司的班车在 7: 00, 8: 00, 8: 30 发车, 小明在 7:50 至 8: 30 之间到达发车站乘坐班车, 且到达发车站的时刻是随机的, 则他等车时间 不超过 10 分钟的概率是 ($\qquad$)

  1. A.$\frac{1}{3}$
  2. B.$\frac{1}{2}$
  3. C.$\frac{2}{3}$
  4. D.$\frac{3}{4}$

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