Once Brahma sat to play dice with Gopal Bhar. One of the two dices only had the even numbers $2, 4, 6$ written on it. The other one had the odd numbers $1, 3, 5$ written on it. The game had come to a point where Gopal would win if the numbers on the dices in his next move add up to $7$. What was the probability of Gopal winning the game in that move?