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Da Vinci's Secret Letter

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How many questions that can be answered by True or False (w/o mentioning any of the letters)

will it take to determine the secret letter inside Da Vinci's letter box?

Q W E R T Y U I O P A S D F G H J K L Z X C V B N M

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Five. Each question can cut the number of possible candidates in half.

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Five. Each question can cut the number of possible candidates in half.

That is the idea but with what question will half them ..

1. Is the secret letter belong to half of them? True!

2. Is the secret letter belong to half of the half it belongs to? False...6 & 7 conflict

..

4. Does it belong to half of the half of that half of that half ? True 2/4

5. Does it belong to 1 of the two? False .. the secret letter is the remaining letter that remains unknown.

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