Question 202488
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        In the post by @Theo,  his solutions,  reasoning and answers for parts  (1)  and  (4) are incorrect.


        I came to bring correct solutions for these parts.



<pre>
(1) In this problem, they ask about distinguishable arrangements of 11 items in the circle.

    For circular permutations/arrangements, taking into account circular symmetry, 


        the answer is  {{{11!/11}}} = 10! = 10*9*8*7*6*5*4*3*2*1 = 3628800.




(4)  In this problem, they ask about distinguishable arrangements of 9 persons around a round table.

     For circular permutations/arrangements, taking into account circular symmetry, 


        the answer is  {{{9!/9}}} = 8! = 8*7*6*5*4*3*2*1 = 40320.
</pre>

Solved correctly.