RING12
08-21-2006, 12:09 PM
:idea: how many arrangment can six people are seated around a circle table?
answer is 120. but i thnk it should be 270.(6!)
answer is 120. but i thnk it should be 270.(6!)
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View Full Version : math help please probablity RING12 08-21-2006, 12:09 PM :idea: how many arrangment can six people are seated around a circle table? answer is 120. but i thnk it should be 270.(6!) cl2137 08-21-2006, 12:12 PM :idea: how many arrangment can six people are seated around a circle table? answer is 120. but i thnk it should be 270.(6!) for a circular table, the formula is (n-1)! So it's 5! desert 08-21-2006, 12:46 PM :idea: how many arrangment can six people are seated around a circle table? answer is 120. but i thnk it should be 270.(6!) If they were sitting in a row of a table, the answer would have been N! = 6! =6*5*4*3*2*1 =720 Since those are sitting in a circle table, two people (#1 and #6) are sitting close. So actually there is only 5! case can be possible. The answer will be N! =5! =6*5*4*3*2*1 = 120 Or you may think (N-1)! = (6-1)! =5! tissy 08-21-2006, 12:52 PM Nice !! If they were sitting in a row of a table, the answer would have been N! = 6! =6*5*4*3*2*1 =720 Since those are sitting in a circle table, two people (#1 and #6) are sitting close. So actually there is only 5! case can be possible. The answer will be N! =5! =6*5*4*3*2*1 = 120 Or you may think (N-1)! = (6-1)! =5! |