# Combinatorics problem

• Sep 13th 2012, 08:42 AM
controlsystem
Combinatorics problem
Okay, so i have this problem;
Five friends are sitting at a round table, how many possibilities are there?
I tried the P formula and faculty, but i'm stuck...
• Sep 13th 2012, 08:50 AM
Plato
Re: Combinatorics problem
Quote:

Originally Posted by controlsystem
Okay, so i have this problem;
Five friends are sitting at a round table, how many possibilities are there?
I tried the P formula and faculty, but i'm stuck...

N different items in a circular arrangement can be done in $(N-1)!$ ways.
• Sep 13th 2012, 09:03 AM
controlsystem
Re: Combinatorics problem
Thank you :)