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 P44 ways.

P44=4!4-4!=4!0!=4!=4×3×2×1=24 ways [Since, Prn=n!n-r!]

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The organizer can arrange the order of their presentation in 4P4 = 4! ways.

4! = 4 x 3 x 2 x 1 = 24 ways.

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