Full Stack Developer -- 6

The budget for this is $4/hour 40 hours/week (non-negotiable) I'm looking for a developer with experience in C# to help develop a Learning Management System. With your application, include a solution in C# to the following problem: Implement int Missing(int[] list, int a, int b), which returns the number of integers between a and b that are missing from the list. Proposals that don't include an answer or use chatGPT to get the answer will be ignored.