单选题:某部门购买了30本笔记本,发给了3组,每个组至少发9本。那么,一共(  )种发放方法。

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  • 题目类型:单选题
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题目内容:
某部门购买了30本笔记本,发给了3组,每个组至少发9本。那么,一共(  )种发放方法。 A.20
B.87
C.140
D.145

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答案解析:

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每道题包含一套图形和可供选择的4个图形,请找出图形排列的规律,选出符合规律的项(  )。

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