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[GRE数学辅导] GRE数学排列组合和概率题目例题解读
3个打字员为4家公司服务,每家公司各有一份文件录入,问每个打字员都收到文件的概率?(C42 C21 )C31 /34 先把文件分为2,1,1三堆,然后把这三堆文件分给三个打字员。2013-04-27 编辑:phoenix
Severity: Notice
Message: Memcache::connect(): Server 127.0.0.1 (tcp 11211, udp 0) failed with: Connection refused (111)
Filename: libraries/Cache_file.php
Line Number: 28
Severity: Warning
Message: Memcache::connect(): Can't connect to 127.0.0.1:11211, Connection refused (111)
Filename: libraries/Cache_file.php
Line Number: 28
2013-04-27 编辑:phoenix