Re: [問題] Please help a "vegetable bird" like me
※ 引述《RainySunDay (Heart fly)》之銘言:
: 1.How many different 6-letter sequences are there that consist of 1 A, 2 B's,
: and 3 C's?
: A:60
不就是不盡相異物的排列嗎?
6!
----- = 60 #
2!3!
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09/13 01:45, , 1F
09/13 01:45, 1F
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09/13 02:36, , 2F
09/13 02:36, 2F
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