108. There are ten spots in library and each spot has 4 tables and ten readers are there, 10 students come into library and want 2 studies in how many ways that they sit in d library so that no chair would be blank?

• 10 tables, each with 4 chairs
  Each table has a different number of persons sitting....This is not possible as there are only 4 chairs.. The different combinations can be 0, 1, 2, 3 and 4...the sixth table would have one of the above combinations..Thus the rule is violated.. Plus, if different numbers of people occupy a table, there would be blank spaces...so how can we calculate the possibilities of the library being fulling occupied.. This is an ambiguous question!
• 11 years agoHelpfull: Yes(6) No(0)
• its 10! as it is mentioned no chair is empty there are only 10 empty chairs in library.
• 11 years agoHelpfull: Yes(0) No(0)
• actually 6 spots remain unfilled because
  the filling is in the order as 1,2,3,4.
  therfore actually 4 places are filled
  and 6 remains unfilled
• 11 years agoHelpfull: Yes(0) No(0)