Wed February 08, 2012 By:

if n persons are seated on a round table, what is the probability that two named individuals will be neighbors?please explain the answer in detail.

Expert Reply
Wed February 08, 2012
Let the two Person be combined as 1 , So number of persons to be seated around the table = n - 1
Also the two persons can arrange their places in 2 ways , Therefore ,
Probability = [(n - 2)fact *  2]/[(n-1)fact] =  2/(n-1)
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