Check for missing number in sequence

Question

I have an List which contains 1,2,4,7,9 for example.

I have a range from 0 to 10.

Is there a way to determine what numbers are missin

Answer 1

var list = new List(new[] { 1, 2, 4, 7, 9 });
var result = Enumerable.Range(0, 10).Except(list);