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很高興為你解答! 根據數列規律: 奇數列為以1開頭,以6為差值的等差數列 偶數列為以6開頭,以6為差值的等差數列,即為6的倍數,“如果”位數是偶數,他的數值就等於他的位數乘3 所以第20位置上的數是60
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