On her vacations Veena visits four cities `(A , B , C a n d D)`in a random order. What is the probability that she visits(i) A before B?(ii) A before B and B before C?(iii) A first and B last?(iv) A either first or second?(v) A just be

On her vacations Veena visits four cities (A,B,C and D) in a random order.What is the probability that she visits (i) A before B? (ii) A beore B and B before C? (iii) A first and B last? (iv) A either first or second? (v) A just before B?

On her vacations Veena visits four cities A, B, C and D in a random order. What is the probability that she visits: a. A before B? b. A before B and B before C? c. A first and B last? d. A either first or second? e. A just before B?

Find the number of ways in which four particular persons A,B,C,D and six more persons can stand in a queue so that A always stands before B,B before and C before D.

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

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

What is the total number of children visiting Super-markets B and D together ?