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II-A Math Combinatorics Lecture One Question #1.21

 
 
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Re: II-A Math Combinatorics Lecture One Question #1.21
hehansen - 2021年09月3日 Friday 17:25
 

I can't see the problem, but can you have neither jacket nor hat?


If I am correct, then this is what 3 * 2 means. The 3 comes from no hat, h1, or h2. The 3 comes from no jacket or j1.