# Multiples of 3 and 5

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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 5 below 1000.
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filter(x -> x % 3 == 0 || x % 5 == 0, 1:999) |> sum |> println
