There is one room. There is one bulb in the room. Three buttons are outside the room of which one is for the bulb.
If bulb is on, one can't see it from outside the room. You are standing outside the room. How will you know, which one is the button of bulb. You can go only once within the room. Reply.............
I will post the answer soon.......................
Switch on the first button, stay for a while.. then switch it off.. Then switch on the second button, now enter the room... if the second button is the correct one, well, the bulb will be glowing.. if it doesn't, then go and touch the bulb.. if its hot, it means, it was glowing for some while which implies first button is the correct one, otherwise, third button is the correct one..
Right?
Ya Right
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