Final answer:
The output of the code 'print(ages[-3:-5])' would result in an error in R because negative indexing does not support ranges. To remove the 3rd to 5th elements, the correct code would be 'ages[-(3:5)]' resulting in '20, 11'. The existing code is invalid as it stands.
Step-by-step explanation:
The question asks about the output of a specific line of code in R: ages = c(20, 11, 18, 5, 33) followed by print(ages[-3:-5]). The output will actually result in an error, because negative indexing does not support ranges in R. Using a negative index like ages[-c(3:5)] would remove the elements at indices 3 to 5; however, ages[-3:-5] is not a valid indexing operation in R. To correctly remove elements 3 to 5, the code should be written as ages[-(3:5)], which would output the remaining elements: 20, 11. If the intention was to use positive indices, then ages[3:5] would output the elements at indices 3 to 5, which are 18, 5, 33. The question seems to be a test of understanding of indexing in R, which is a key concept in programming, particularly in a data manipulation context.