numbers, original 6: 10 75 23 18 53 18 IndexOf(18) 3 LastIndexOf(18) 5 numbers, sorted 6: 10 18 18 23 53 75 BinarySearch(23) 3 numbers, reversed 6: 75 53 23 18 18 10 numbers2 4: 75 53 23 18 numbers, cleared 6: 75 0 0 0 0 10