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Find the number that don't exist in another array
A = {1,2,3,4,5,6,7,8,9,10}

B = {1,2,3,7,8}

result = {4,5,6,9,10}

var C = A.Except(B);

int[] C = A.Except(B).ToArray();

var arrayA = new [] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

var arrayB = new [] { 1, 2, 3, 7, 8 };

var result = arrayA.Except(arrayB);

public void Linq52()
{
    int[] numbersA = { 0, 2, 4, 5, 6, 8, 9 };
    int[] numbersB = { 1, 3, 5, 7, 8 };

    IEnumerable<int> aOnlyNumbers = numbersA.Except(numbersB);

    Console.WriteLine("Numbers in first array but not second array:");
    foreach (var n in aOnlyNumbers)
    {
        Console.WriteLine(n);
    }
}