Index of 11 or -1.
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using System;
class Program
{
static void Main()
{
int[] arr = { 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26 }; int target = 11;
int idx = -1;
for (int j = 0; j < arr.Length; j++) if (arr[j] == target) { idx = j; break; }
Console.WriteLine(idx);
}
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