hedgeforfun 当前离线
高级会员
How many different 6-letter sequences are there that consist of 1 A, 2 B's and 3 C's ?
A 6
B.60
C.120
D.360
E.720
The answer is B. Does anyone know how to figure it out? Tks.
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bobiouou 当前离线
自2003年开始提供 MBA 申请服务以来,保持着90% 以上的成功率,其中Top10 MBA服务成功率更是高达95%