When will I win the first prize of Shuangseqiu? I have been keeping my number for almost two years~!

There are 17,721,088 possibilities for the double-color ball. If you keep the number for two years, you will buy about 306 draws (about 153 draws for the double-color ball every year). If you keep the number for 50 years, it will be 7,650 draws. If your son and grandson each keep their names for another 50 years, they will only have 22,950 periods. Then, the probability of your success in keeping the number for three generations is less than 0.13. Be patient and good luck!