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12順序:1.首位為奇:12有3個位置故為3*2*2=122.首位為偶:第一位從其他2個偶數中選擇,12有兩個位置.故為2*2*2=821順序,同上:1.首位為奇:第一位從其他2個偶數中選擇,12有兩個位置.故為2*2*2= 82.12有3個位置故為3*2…
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