250==01,04,06,08,11,13,15,16,19,20,23,24,28,31,32,34,35,37,39,40,42,44,46,49,（共24个）对24


251==01,02,05,06,08,11,12,13,15,17,18,19,20,24,28,30,32,33,36,37,42,44,48,49,（共24个）错14




252==01,02,05,07,12,14,15,17,20,21,23,24,25,26,27,32,33,34,37,38,41,42,47,49,（共24个）