There are 1000 doors that are of the open-close type. When a person opens the door he closes it and then opens the other. When the first person goes he opens-closes the doors ion the multiples of 1 i.e., he opens and closes all the doors. When the second goes he opens and closes the doors 2, 4 6 8 rely. Similarly when the third one goes he does this for 3 6 9 12 15th doors rely. Find number of doors that are open at last.


No Answer is Posted For this Question
Be the First to Post Answer

Post New Answer

More General Aptitude Interview Questions

which one of the following usages was a vedic development?

0 Answers   NMDC,


Number Series 11,14,12,15,13,16,?

14 Answers   TCS,


I bought a car with a peculiar 5 digit numbered licence plate which on reversing could still be read. On reversing value is increased by 78633. Whats the original number if all digits were different?

0 Answers   Infosys,


Please Send me a SBI Clark ship Question Paper ?

0 Answers   State Bank Of India SBI,


Given a rectangular (cuboidal for the puritans) cake with a rectangular piece removed (any size or orientation), how would you cut the remainder of the cake into two equal halves with one straight cut of a knife?

15 Answers   Microsoft,






Consider a pile of Diamonds on a table.A thief enters and steals 1/2 of th e total quanity and then again 2 extra from the remaining. After some time a second thief enters and steals 1/2 of the remaining+2. Then 3rd thief enters and steals 1/2 of the remaining+2.Then 4th thief enters and steals 1/2 of the remaining+2.When the 5th one enters he finds 1 diamond on the table.Find out the total no. of diamonds originally on the table before the 1st thief entered.

0 Answers   Infosys,


A boy has Rs 3 in total. If he wins, he gains 1 Rupee and if he looses, he has to loose 1 Rupee. The boy may lose only 5 times in the game and if he earns 5 Rs, he has to quit the game. Find the number of ways of the possibilities.

0 Answers   CGI,


If a car starts from A towards B with some velocity due to some problem in the engine after travelling 30km.If the car goes with 4/5 th of its actuval velocity the car reaches B 45min later to the actual time. If the car engine fails ofter travelling 45km, the car reaches the destination B 36min late to the actual time , what is the initial velocity of car and what is the distance between A and B in km ans) 20 &

0 Answers   IBM,


13_46_8_180_210_75 = 64 . Use + and – in the empty places to make the equation holds good. Take m = number of + and n = number of – . Find m – n?

0 Answers   Infosys,


What is the smallest number by which 4880 must be divided in order to make it into a perfect square ?

0 Answers   3i Infotech,


There were 750 people when the first song was sung. After each song 50 people are leaving the hall. Howmany songs are sung to make them zero?

1 Answers  


Package information is stored in a) DB2 Directory b) DB2 system tables c) DB2 catalog tables d) None of the above

0 Answers  


Categories