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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
2024-08-15
20
管理
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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