Two persons A, B have to speak at a function with 10 other persons. If the persons speak at random order, the probability that A speaks immediately before B is

Three persons A, B, and C are to speak at a function along with 7 other persons. If the persons speak in random order, the probability that A speak before B and B speak before C is

Three persons A, B, and C are to speak at a function along with 5 other persons. If the person speak in random order, the probability that A speaks before B and B speaks before C is

Three persons A,B and C are to speak at a function with 5 other persons.If the persons speakin random order,the probability that A speaks before B and C speaks before A in that order is

Three persons A, B and C speak at a function along with 5 other persons. If the persons speak at random, find the probability that A speaks before B and B speaks before C

Three persons A,B and C speak at a function along with 5 other persons.If the persons speak at random,find the probability that A speaks before B and B speaks before C

Three persons A,B,C speak at a function alongwith 7 others in a random order . The probabiltiy that A speaks before B and B speaks before C at the function is :