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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-




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 ?
Amaintenancemanagerwishestorepair8outof15machinesdown.Inhowmanywayscanhecreatealistof8machinesaIfhehastoprecisethehourofrepairofeachofthem?bIfhedoesntprecisethehourofrepairofeachofthem?cHavenchosenthe8machines,inhowmanywayscanhedefinetheorderofrepairofeachofthem?

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