Sum [3, 6, 9, 12, 15, 18, 21, 24, 27, 30].
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using System;
class Program
{
static void Main()
{
int[] arr = { 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 };
int sum = 0; foreach (var x in arr) sum += x;
Console.WriteLine(sum);
}
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