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四比特數位個十百千 又因為奇數不相鄰 分三種情况 個百或十千或個千 先看個百為奇數 所以是A32A32=36 三個奇數兩個位置順序排列乘上三個偶數兩個位置順序排列 十千同個百=36 個千也是A32A32=36 所以總計36*3=108種
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