【高中数学】排列组合中先分组再分配例题
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每个地方至少几人——先分组再分配
分组要看均分了几组，就要除以A几几（几！）
分完组后要记得分配
分组要看均分了几组，就要除以A几几（几！）
分完组后要记得分配
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