已知数列 为等差数列，且 则 等于（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='24364' and id < 2100865 and id<>'2100865' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='24364' and id > 2100865 and id<>'2100865' order by id asc limit 5