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Project Euler

The following task is taken from Project Euler. It's the first task there. Project Euler is a series of challenging mathematical and computer programming problems.

Exercise

Write a function sumMultiples taking a natural number n and returning the sum of all multiples of 3 and of 5 that are truly less than n.

Example: All multiples of 3 and 5 less than 20 are 3, 5, 6, 9, 10, 12, 15 and 18. Their sum is 78. sumMultiples(20) should return 78.