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Question Number 180186 by Ar Brandon last updated on 08/Nov/22

   A maintenance manager wishes to repair 8 out of   15 machines down. In how many ways can he create  a list of 8 machines  a\ If he has to precise the hour of repair of each of them ?  b\ If he doesn′t precise the hour of repair of each of them ?  c\ Haven chosen the 8 machines, in how many ways can  he define the order of repair of each of them ?

$$\:\:\:\mathrm{A}\:\mathrm{maintenance}\:\mathrm{manager}\:\mathrm{wishes}\:\mathrm{to}\:\mathrm{repair}\:\mathrm{8}\:\mathrm{out}\:\mathrm{of}\: \\ $$$$\mathrm{15}\:\mathrm{machines}\:\mathrm{down}.\:\mathrm{In}\:\mathrm{how}\:\mathrm{many}\:\mathrm{ways}\:\mathrm{can}\:\mathrm{he}\:\mathrm{create} \\ $$$$\mathrm{a}\:\mathrm{list}\:\mathrm{of}\:\mathrm{8}\:\mathrm{machines} \\ $$$$\mathrm{a}\backslash\:\mathrm{If}\:\mathrm{he}\:\mathrm{has}\:\mathrm{to}\:\mathrm{precise}\:\mathrm{the}\:\mathrm{hour}\:\mathrm{of}\:\mathrm{repair}\:\mathrm{of}\:\mathrm{each}\:\mathrm{of}\:\mathrm{them}\:? \\ $$$$\mathrm{b}\backslash\:\mathrm{If}\:\mathrm{he}\:\mathrm{doesn}'\mathrm{t}\:\mathrm{precise}\:\mathrm{the}\:\mathrm{hour}\:\mathrm{of}\:\mathrm{repair}\:\mathrm{of}\:\mathrm{each}\:\mathrm{of}\:\mathrm{them}\:? \\ $$$$\mathrm{c}\backslash\:\mathrm{Haven}\:\mathrm{chosen}\:\mathrm{the}\:\mathrm{8}\:\mathrm{machines},\:\mathrm{in}\:\mathrm{how}\:\mathrm{many}\:\mathrm{ways}\:\mathrm{can} \\ $$$$\mathrm{he}\:\mathrm{define}\:\mathrm{the}\:\mathrm{order}\:\mathrm{of}\:\mathrm{repair}\:\mathrm{of}\:\mathrm{each}\:\mathrm{of}\:\mathrm{them}\:? \\ $$

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