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circular permutation

Expert replies
Source: — Problem Solving |

by shankar.ashwin » Wed Sep 28, 2011 6:16 am
First 5 people can be selected from a group of 6 in 6C5 ways = 6.

5 people can be seated in a circular arrangement in (5-1)! ways.

So 6*4! = 144

E
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by navami » Wed Sep 28, 2011 7:39 am
agree ans should be nCr * (r-1)!
This time no looking back!!!
Navami
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