bnbf 当前离线
高级会员
The question is:
How many different 6-letter sequences are there that consist of 1A, 2B's, and 3C's?
A.6 B.60 C.120 D.360 E.720
Thank you in advance!
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mary1 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%