平均分配为什么要除以阶乘

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select * from tbl_Articles WHERE ArticleID=3191972 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3191972 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3191972 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1196669,3456686,1019887,3291295,3513322,579748,3018892,1809400,1213353,2508996,778110,2674781,846990,3506508,1144999,1136361,1814007,2541424,2707579,752257,885875,657305,3482245,2942247,2484025,1131992,733417,3477775,3453580,3484454) ORDER BY field (ArticleID,1196669,3456686,1019887,3291295,3513322,579748,3018892,1809400,1213353,2508996,778110,2674781,846990,3506508,1144999,1136361,1814007,2541424,2707579,752257,885875,657305,3482245,2942247,2484025,1131992,733417,3477775,3453580,3484454)