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If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. Find the sum of all the multiples of 3 or … Continue reading
A couple of years ago when I was still a graduate student in NUS, I used to have regular drinks with my good friend Andreas Keil. Those were evenings wellspent as we exchanged lots of views over lots of topics. … Continue reading