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In a series of races, 10 toy cars are raced, 2 cars at a time. If each car must
In a series of races, 10 toy cars are raced, 2 cars at a time. If each car must
游客
2024-01-12
12
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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、40
B、90
C、100
D、180
E、200
答案
B
解析
在一系列比赛中,有10辆玩具汽车进行比赛,每场比赛有2辆汽车参加。若每辆汽车必须和其他的各辆汽车比赛两次,问一共要举行有多少场比赛?
解:本题的正确答案为(B)。10辆车中,每辆车与另一辆车比赛一次,相当于从10辆汽车中任选2辆车比赛,共45次;而比赛2次,则共有2×45=90次。
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