Here’s a classic brainteaser that I don’t like. What’s the next number in this sequence: 1, 11, 21, 1211, 111221, …? The answer is 312211, because each number describes the digits in the number that ...
Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter.
In today’s picture puzzle, how many number 6s can you find in this image? In the above image, you can all see a young woman standing on a road holding a rectangular cardboard sign. Behind her, there ...
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