Riddle 1: Multiples of 3 or 5
The Task:
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 5 below 1000.
As often with these kind of riddles, there is a stra...
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