Comment by Aradalf

This is interestingly very similar to the Computer Science specific questions on the Oxford Mathematics Admissions Test (MAT).

For examples, look at page 16 of the 2013 exam: https://www.maths.ox.ac.uk/system/files/attachments/test13.p...

and page 16 of the 2014 exam: https://www.maths.ox.ac.uk/system/files/attachments/test14.p...