2. 外语
  3. In a series of races, 10 toy cars are raced, 2 cars at a time. If each car must race each of the other cars exactly twice, how m

In a series of races, 10 toy cars are raced, 2 cars at a time. If each car must race each of the other cars exactly twice, how m

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问题 In a series of races, 10 toy cars are raced, 2 cars at a time. If each car must race each of the other cars exactly twice, how many races must be held?
选项 A、45
B、90
C、180
D、200
E、100
答案B
解析 由于每辆车和其他各辆车要比赛两次，因此一共为：C102×2=90。
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