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  3. A man has 29 socks in his drawer, 9 identical blue, 8 identical grey and 12 iden

A man has 29 socks in his drawer, 9 identical blue, 8 identical grey and 12 iden

游客2023-10-17  23
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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