It's simple. If 35 chooses 5, 35 has five possibilities, and the probability is 1/(35 5). The winning probability of 3D lottery is 1/( 10 3), which is one thousandth. The formula is lottery winning number n and winning number m, so1/n m, (the above formula is the possibility of winning the first prize, excluding other winning possibilities for the time being. Other possibilities of winning should be determined according to the actual rules of the game. )