Problem :
Michael have ten pairs of black socks, eight pairs of white socks and seven pairs of green socks. Everything is mixed in a draw. As there is no light he were not able to identify the color of the socks. How many of the socks did he want to take to match one pair ?
Solution:
The answer is 4 since in worst case all 3 socks taken first will be different color then the 4th one would be repetition. However if we consider a left sock to be different from right one, then at least 10 + 8 + 7 + 1 = 26 socks are needed.
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