5676脑筋急转弯中等数值题medium
Seven Tasks Four Machines All Busy
题目
Seven distinct tasks are each assigned to one of 4 distinct machines. In how many assignments is every machine used at least once?
解题计时
0:00
提交作答时记录，用于后续平均用时统计。
你的答案
题目
Seven distinct tasks are each assigned to one of 4 distinct machines. In how many assignments is every machine used at least once?
解题计时
0:00
提交作答时记录，用于后续平均用时统计。
你的答案