The winning probability is divided into two situations: two dice have the same number of points as the bet, and three dice have the same number of points as the bet.
The probability of two dice with the same number of points is: the probability of choosing two dice with the same number of points is (1/6) 2 = 1/36, and there are six possibilities for the remaining 1 dice, so the probability of this situation is 6 * (1/36) = 66.
The probability that the number of three dice is the same as the number of bets is: the probability of choosing three dice with the same number of bets is (1/6) 3 =1/216.