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MC II-B Combinatorics Self-paced

 
 
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Re: MC II-B Combinatorics Self-paced
WangDr. Kevin - 2020年07月23日 Thursday 23:02
 

The recursive formula is in Problem 7.9(b).  You can watch the video lecture for that problem, or check the solution at the end of the book.

The PIE method does work.  If you calculate the union correctly, you should get the right answer.  If you show the details of your work, the teachers or other students may help out.