172期:半数【《02,03,05,06,07,08,09,11,12,16,20,21,22,23,26,27,30,33,34,36,38,40,42,45》】开:21准
173期:半数【《01,03,07,08,10,11,12,14,18,20,21,23,25,30,31,32,36,39,41,44,45,46,47,49》】开:20准
174期:半数【《01,04,05,06,08,09,11,13,15,16,22,27,29,31,32,33,34,37,38,39,40,42,43,46》】开:10错
175期:半数【《04,07,09,10,11,18,20,22,23,24,25,26,29,30,31,35,36,37,38,41,43,44,47,49》】开:？？？？