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Math Challenge II-A Combinatorics

 
 
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Math Challenge II-A Combinatorics
by Neo Liang - Friday, 11 October 2019, 3:23 PM
 

Lecture 4, Problem 4.29

I think the answer should be 44, but the answer says that it is 76. I got 44 because the answer is $\dfrac{5!}{0!} - \dfrac{5!}{1!} + \dfrac{5!}{2!} - \dfrac{5!}{3!} + \dfrac{5!}{4!} - \dfrac{5!}{5!}$. I think I'm right, and the answer should be 44.

 
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Re: Math Challenge II-A Combinatorics
by Areteem Professor - Friday, 11 October 2019, 6:25 PM
 

You are correct, the solution was missing one term. The quiz should be displaying the correct solution now. Thanks for letting us know!