Problem 1: Multiples of 3 and 5
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 the provided parameter value number.
Solution:
function multiplesOf3and5(number) {
  let sum = 0;
  for(let i=3; i < number; i++) {
    if(i%3 === 0 || i%5 === 0) {
      sum += i
    }
  }
  return sum;
}
multiplesOf3and5(49);
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