Hint to Puzzle #36: N Face Up Cards In A Dark Room
Let's look at some things the puzzle does and doesn't say.
- It doesn't say we need to create two equal piles of 26 cards. It just says two piles with the same number of face up cards, nothing about the number of face down cards.
- It doesn't say that they need to be the same cards that are face up as at the start of the puzzle or that the same number of cards should be face up.
- It is assumed that we know the value of N.
The answer is astonishingly simple, and as always contains no slight of hand, no tricks.
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