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A man has 29 socks in his drawer, 9 identical blue, 8 i……

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

A.21
B.14
C.23
D.24
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单项选择题B