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7) ¿De cuántas maneras pueden sentarse diez personas alrededor de una mesa circular?

2 Answers

7 votes
Sí entran todos los elementos. Tienen que sentarse las 8 personas
Sí importa el orden
No se repiten los elementos. Una persona no se puede repetir. P8=8!=40320

User StickyCube
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4 votes

Answer: Around a circular table, ten people can be seated 362880 ways.

Step-by-step explanation:

We establish the conditions of the exercise:

  • Yes, all elements fit. 10 people have to sit.
  • Being a circular arrangement we must eliminate the circular repetitions
  • Items are not repeated. A person cannot be repeated.

It is a Combination so we use the formula:


\boldsymbol{\sf{_(n)C_(r)=\cfrac{n!}{n\cdot (n-r)!} }}


\boldsymbol{\sf{n=10\; \; \; \; \; r=10}}

We substitute and solve:


\boldsymbol{\sf{_(10)C_(10)=\cfrac{10!}{10\cdot (10-10)!}=9!=9\cdot8\cdot7\cdot 6\cdot 5\cdot 4\cdot 3\cdot 2\cdot 1=362880}}

User Nilesh Ukey
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4.0k points