Mathematics
Senior High
想問第二小題
2 用0,1,1,1,1,2,2共7個數字作成七位數,則下列方法各多少個?
(1)四個1要完全相鄰。
(2)恰三個1完全相鄰且二個2也相鄰。
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想問第二小題
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