2. 外语
  3. A man has 29 socks in his drawer, 9 identical blue, 8 identical grey and 12 identical black. The lights have fused and he is com

A man has 29 socks in his drawer, 9 identical blue, 8 identical grey and 12 identical black. The lights have fused and he is com

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问题 A man has 29 socks in his drawer, 9 identical blue, 8 identical grey and 12 identical black. The lights have fused and he is completely in the dark. How many socks must he take out to make certain that he has a pair of each colour?
选项 A、21.
B、14.
C、23
D、24
答案C
解析 每种颜色有两只，在完全黑暗的情况下，三种颜色完全看不出来，只有去算最大化的可能，即12+9+2=23，只有这样才能保证每种颜色有2只。所以选项C正确。
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本试题收录于： C类竞赛（非英语专业本科）题库大学生英语竞赛（NECCS）分类
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C类竞赛（非英语专业本科）

大学生英语竞赛（NECCS）

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