Seven different lecturers are to deliver lectures in seven perday. A, B and C are three oftne lectures. The number of ways in which a routine for theday canr be made such that A delivers his lecture before B and B before C, is

Seven different lecturers are to deliver lectures in seven periods of a class on a particular day X,Y and Z are three of the lecturers . The number of ways in which a routine for the day can be made such that X delivers his lecture before Y and Y before Z , is :

A,B,C are three persons amongst seven persons who speak at a function . The number of ways in which it can be done if A speaks before B and B speaks before C is

There are 4 doors to a lecture room . The number of ways in which a student can enter the room and leave it by different door is

A,B ,C are three persons among 7 persons who speak at a function.The number of ways in which it can be done if A speaks before B and B speaks before C is

Ten persons amongst whom are A,B and C are to speak at a function the number of ways in which it can be done if A wants to speak before B and B wants to speak before C is

A, B, C are three persons among 7 persons who speak at a function. The number of waysin which it can be done if 'A' speaks before 'B' and 'B' speaks before 'C' is

Ten persons, amongst whom are A, B and C are to speak at function. Find number of ways in which it can be done if A wants to speak before B, and B wants to speak before C ?

The number of ways in which 7 persons can address a meeting so that out of the three persons A, B and C, A will speak before B and B before C is