Fifteen persons, among whom are A and B, sit down at random on a round table. The probability that there are 4 persons between A and B, is

Fifteen person, among whom are A and B , sit down at random at a round table, the probability that there are exactly are 4 persons between A and B is

Twenty persons among whom A and B, sit at random around a round table,then the probability that there are any 6 persons between A and B is

20 girls, among whom are A and B sit down at a round table. The probability that there are 4 girls between A and B is:

1:20 persons among whom A and B sit in random along a round table. The probability that there are 6 persons between A and B is 2//19 . II: Out of 30 consecutive integers 2 are drawn at random. The probabilty that their sum is odd is 15//29 .

A and B are among 20 persons sit at random along a round table. Find the probability that there are any 6 persons between A and B.

A and B are among 30 persons who sit at random along a round table. Find the probability that there are any six persons between A and B .