domenica 5 settembre 2010

Problem 1

Problem 1

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.

solution = sum $ [x | x ←  [1..999], or [mod x 3 ≡ 0, mod x 5 ≡ 0]]

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