Sudoku

sudoku8

Puzzle

One Bulb with 3 Switches

 You have 3 switches in a room. One of them is for a bulb in next room. You can not see whether the bulb is on or off, until you enter the room. What is the minimum number of times you need to go in to the room to determine which switch corresponds to the bulb in next room.

Answer :

At least 2 times , will need to go in to the room to determine which switch corresponds to the bulb in the next room.