It's Just Not Possible
When Question Mark was showing Skid Mark that he could turn 3 cups up the right way in 2 moves, turning 2 cups at a time, Skid laughed and said "That's easy!"
The cups were arranged like so:
Down - Up - Down
The 2 moves were:
Up - Down - Down
Up - Up - Up
When Question Mark turned 1 cup over to reset the challenge, Skid just couldn't do it. Why?
AnswerQuestion Mark turned over 1 cup to make the set up like so:
Up - Down - Up
That setup is impossible to solve.
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