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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
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 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.
