Simple demo for XOR

Program.cs

class Program 
{ 
	static void Main(string[] args) 
	{ 
		int[] a1 = { 1, 1, 2 }; 
		int[] a2 = { 17, 17, 3, 17, 17, 17, 17 }; 
 
		n1 = GetStrayNumber(a1); 
		n2 = GetStrayNumber(a2); 

		WriteLine($"n1 => {n1}, n2 => {n2}"); 
	} 
 
	private static int GetStrayNumber(int[] arr) 
	{ 
		Func<int, string> format = n => $"{n} ({Convert.ToString(n, 2).PadLeft(5, '0')})"; 
 
		var xor = arr[0]; 
		for (int i = 0; i < arr.Length - 1; i++) 
		{ 
			var a = xor; 
			var b = arr[i + 1]; 
			xor = a ^ b; 
 
			WriteLine($"{format(a)} ^ {format(b)} = {format(xor)}"); 
		} 
		WriteLine(new string('=', 80)); 
 
		return xor; 
	} 
}