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  5. 想問第三小題 謝謝
Mathematics
Senior High
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想問第三小題 謝謝

15.將 inclusion 九個字母全取排成:89320 (1)任意排列,有362880種排法。 50X 排法 (2)若相同字母必須相鄰,有 (3)若相同字母必不相鄰,有781440種排法。 55440

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