Given a table, there are now 18 courses in total, each course lasts 7 days, but only starts on weekdays, the first day starts on Friday, then when the last course ends?
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数学PS
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Given a table, there are now 18 courses in total, each course lasts 7 days, but only starts on weekdays, the first day starts on Friday, then when the last course ends?
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正确答案: B