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一列數,不是一個數列,題意不明,有兩種情況: 1、2 5 8 11 14 是一個循環,總共就這5個數,反覆排,1995是5的倍數,那麼1995個數是14 2、這是一等差數列,數列的首項是2,公差是3,求第1995項 那麼根據公式可得a1995=2+(1995-1)×3=5984
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