Problem 105 October 2001If 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.Answer:233168Solution in C# using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Numerics;namespace Euler { static class Program { static ..