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A product testing company will test 7 different fax machines by linking every possible pair and transmitting first from one machine to the other and then transmitting in the opposite direction. Thus, 2 transmissions will occur in testing each pair. If each transmission takes 10 minutes, how many minutes of transmission time will it take to test all of the machines?
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· 相关考点
6.3.4 排列
6.3.4 排列
以上解析由 考满分老师提供。
