My First Book
I am so happy that I met Ivo David and Yogev Shpilman. Together, wrote the book Mathematical Puzzles and Curiosities, and had so much fun on the way. I have already mentioned one of the puzzles from the book on my blog—Two Points on a Cube. Here is another one.
Puzzle. Consider the sequence: O, T, R, F, I, S, ?
What letter should replace the question mark?
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