[中學] 排列組合
用「‧」和「—」兩種記號進行直線排列,在允許重
複選取的的情況下,取用的記號應有____個,才
能作成50種不同的信號。
解答:5
可能是我國文太差,看不懂題意
有請大大幫解
感謝
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◆ From: 114.27.185.127
推
04/19 12:42, , 1F
04/19 12:42, 1F
→
04/19 12:42, , 2F
04/19 12:42, 2F
→
04/19 12:44, , 3F
04/19 12:44, 3F
推
04/19 13:01, , 4F
04/19 13:01, 4F
→
04/19 13:16, , 5F
04/19 13:16, 5F
推
04/19 13:54, , 6F
04/19 13:54, 6F
→
04/19 15:20, , 7F
04/19 15:20, 7F
推
04/20 20:51, , 8F
04/20 20:51, 8F
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