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Once you have solved a problem it's instructive to try to think of another (perhaps better?) method of solution. On one famous occasion I did not expect different methods but two school students sent in not 2 but 8 different solutions of the same problem. Not content with that these two students then generalised the problem.

See Eight Methods for Three by One and also Why stop at Three by One ?

Can you beat that? I expect their teacher at Madras College will remember it. Perhaps that school can score again, but what about other schools? This is a challenge calling for the combined efforts of a group of students or a whole class.