A high school has astrange
principal .on the 1st day he has his
student perform an odd opening day
ceremony .there is 1000 locker &
1000 student in the school. The
principal asks the the 1st student to
go to every locker & open it.then he
has the 2nd student go to every 2nd
locker & close it.the 3rd student
goes to every 3rd locker & if it is
closed he opens it & if it is open
then he close it .the 4th student
goes to every 4th locker & so on
.after the process is completed with
the 1000 student how many lockers
are open

• 1 locker alone open
• 9 years agoHelpfull: Yes(0) No(0)
• odd is open from the same number
  even is closed from the same number
  they left previous numbers so
  _ _ _ _ _
  1 2 3 4 5 6 7 8 9 10
  are open for 1000
  500 are open
• 9 years agoHelpfull: Yes(0) No(0)
• 1st student opens every locker.
  2nd student closes the lockers 2,4,6,8,.....
  3rd student opens or closes the lockers 3,6,9,12,......
  in this way if yu proceed,
  
  all the perfect square numbered lockers will be open
• 9 years agoHelpfull: Yes(0) No(0)