Latest TCS Aptitude Question SOLUTION: 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 libr

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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?

Asked In TCS M.JOSHNA (11 years ago)

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dipali  (11 years ago)

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!

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sri  (10 years ago)

its 10! as it is mentioned no chair is empty there are only 10 empty chairs in library.

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krishna  (10 years ago)

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

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