Out of 11 persons sitting at a round table, 3 persons `A, B and C` are chosen at random, then the probability that no two of these are sitting next to one another is

Out of 10 persons sitting at a round table, three persons are selected at random then the probability that no two of them are consecutive is

Out of 12 persons sitting at a round table three persons are chosen at random. The probability that no two of them are consecutive is

Out of 10 persons sitting at a round table, three persons A,B and C are selectyed at random. The chance that no two of these are sitting together is

Out of n persons sitting at a round table, three, A, B, C are chosen at random. The chance that no two of these are sitting next to one another is

Out of n persons sitting at a round table, three, A, B, C are chosen at random. The chance that no two of these are sitting next to one another is

Out of 15 persons sitting around a round table, four particular persons A, B.C and D are chosen at random.The chance that no two of these four are sitting next to one another,is

Out of 10 persons sitting at a round table, two persons are selected at random then the probability that they are not adjacent to each other is

n persons are seated on n chairs at a round table. Find the probability that two specified persons are sitting next to each other.

(n>=5) persons are sitting in a row. Three of these are selected at random. The probability that no two of the selected persons sit together is

(n>=5) persons are sitting in a row. Three of these are selected at random. The probability that no two of the selected persons sit together is