Can you solve it? The man who made India’s trains run on time
by Alex Bellos from Science | The Guardian on (#6EV7E)
Get your brain on track
UPDATE: The solutions can be read here
By day, Shyam Sunder Gupta was Principal Chief Engineer of Indian Railways. By night, he was a guru of recreational mathematics.
For decades, Gupta spent his free time exploring patterns in numbers, his numerical curiosities finding their way into journals, magazines and books.
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