Puzzle of the Day : 16
Three wise men decided to find out who was the wisest of them all . So they went to the grandmaster and asked him to devise a constent . The grand master agreed and taking them into a dark room, he said ‘I am going to paint a dot on your forehead. It could be either red or blue. Then the lights in this room will be turned on . When you see at least one red dot you should put up your hand. The one to identify the colour of the dot on his own forehead first will be the winner of the contest. He will be declared the wisest among you.’ He then painted red dots on the foreheads of all three of them , and the lights were turned on. At the moment all three put up their hands . After a little while one of them said that he had a red dot on his forehead. How did he find out ?