Prime Minister of Einsteinia died in a tragic accident. The King of Einsteinia had to choose the new Prime Minister from the core council consisting of three extremely intelligent advisors. The King wanted to make the wisest of them the new Prime Minister. He devised a plan to test their intelligence.
He put a sticker on the forehead of each of the three advisors. Each sticker was either black or white in colour. Each of the three advisors could see the colour of the stickers on the forehead of the other two but not his own forehead. The king then told them that anyone who could see at least one white sticker should raise his hand. All three of them raised their hands. He then asked them to deduce the colour of the sticker on their own foreheads. The first one to do so correctly would be made the new Prime Minister. Anyone making an incorrect guess would be beheaded.
After sometime, one of them said - "The colour of the sticker on my forehead is …….". What was the colour of the sticker on his forehead? Please provide detailed justification for your answer.