## Online Course Discussion Forum

### Question on II-A Combinatorics

Question on II-A Combinatorics

Hi, I have a question on II-A Chapter 2 Combinatorics. Question number 2.28, in the answer key it said 6!*5!*7*6. I am kind of confused about the ordering of the German books. In the problem, am I suppose to first order the German books which is 6!. Then I have 7 spaces left for Spanish or France. In conclusion, I think it would be  6!*7*6*6!*5! because imagine the books in a bag and you have 7 places to put it and then the second bag only has 6 places left. Then in each bag, you can reorder the books. It would be great if someone can help me with this question.

Thank you so much!

Best Bober

Re: Question on II-A Combinatorics

Thanks for letting us know.

6!*7*6*6!*5! is correct. I'm guessing you saw the answer in the print book? It's possible that there was a typo there. Remember you can always review the question (plus the solution) by looking at the MC II-A homework.

You can also find answer keys online here: https://classes.areteem.org/static/MCIIASampleSyllabus.html