Suppose that I have a friend whose name is X. X has his elder brother who got married 10 years before. But X being a silly guy has the habit of forgetting things; you can say a “Short time memory loss”. This summer he is going to meet his brother after 10 years, and he has planned to purchase some clothes for his brother’s kids as a token of love. Each and every time he faces a problem he comes to me, so this time also, he came to seek help, and I have not left him empty handed. I told him that as far as I can recall, his brother has two child and one of the boy was born on Tuesday. Now, it’s your turn to help him.  What is the **Probability** that X's brother has two boys? Assume an equal chance of giving birth to either sex and an equal chance to giving birth on any day.