Question

Imagine that there is a building of 10000 floors not including grd floor.The lift in that building starts to rise from 1st floor.There is one person on each floor and from 1st floor to 10000th floor the lift will open on each floor.Assume that all buttons are closed from inside and the button on each floor is pressed.Now when the person at 1st floor comes in the lift he inverse all the buttoms means if the button is closed he opens it oor if the buttom is open he close it.Since at 1st floor all buttons are closed so he opened all the buttons,and the person left the lift,when person at 2nd floor entered the lift he also inversed the multiples of 2 i.e. all even no.,as all were open so he closed all multiples of 2 upto 10000 and left ,now the person at 3rd floor enters and inversed his multiples.This goes on till 10000th floor.Now tell when the person at 10000th floor will do the same how many buttons will remain on..Assume that stopping of the lift on each floor does not get effected by the buttoms inside

Answer 1

I believe its gonna come in ur exams????????

Answer 2

Answer:

hi........!

Step-by-step explanation:

I think Multiple of 10000

Like multiple of 2

and

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plz