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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Konstantin:
Congrats!
18 April 2026, 7:40 amZarunias:
If the sequence was O,T,R,O,I,S;? I could confidently say that the solution would be V. But this sequence is close enough (and the F is something that easily could happen if you aren’t careful) that I’m not sure if this was a mistake or if I have to look further.
18 April 2026, 9:02 amJohnG:
I’ll go with E
6 May 2026, 5:56 pm