P,Q,R and S have to give lectures to an audience. the organizer can arrange the order of their presentation in :a) 4 ways b)12 ways c)256 ways d)24 ways
Since, the number of lecturers is 4.
Therefore, the organiser can arrange the order of their presentation in ways.
ways [Since, ]
Therefore, the organiser can arrange the order of their presentation in ways.
ways [Since, ]