. Along a long corridor there are 100 doors marked as 1,2,3.......100 and 100 persons with no. from 1 to 100.Initially all doors are open.Person no. 1 changes the state of all doors that are multiple of 1 i.e basically all doors.Person 2 then changes the state of all doors that are multiple of 2.Person 3 then changes the state of all doors that are multiple of 3 and so on till the person number 100 changes state of door 100.How many doors are closed finally after all operations? 1. 10 2. 90 3. 50 4. Non of these.
Posted on: Tue, 11 Mar 2014 09:04:15 +0000
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