Digital Logic design interview questions
The question is ambiguous, although sometimes interview questions are intentionally ambiguous to prompt a discussion of the ambiguities.
One way to look at it is, if you are verifying a design for a 4-input sorting network, how many input sequences are needed to be sure the implementation is correct. If you don't know anything about how it's implemented, then you need to test all $4!$ permutations of four values to be absolutely certain the implementation is correct.
Another way to look at it is, if you manufacture the circuit, how many input sequences do you need to apply to each device during testing to be sure the circuit was manufactured correctly. In this case you would usually take the design as a given, so you don't need to cover all $4!$ permutations, you just need enough inputs to cover the interesting cases for each element of the circuit. I'm guessing this was the intention of the question, and I'm guessing that only two cases are considered interesting for each MinMax2 component (A>B and Awhy technology roadmap when entrepreneurial activities slow down which solutions does iqbusiness offer whom synonyms and antonyms whose solution is used for whitewashing who solution recipe which development is best how much start up capital do you need how much develop an app where to develop photos near me who teaches aang firebending when entrepreneur scheme was introduced by sbi how manager communicate with employee how many science regents are required to graduate why device is not playing for nip whose project is nlex what product protects polish from chipping how product managers work with data scientists why solution is called homogeneous mixture how entrepreneur become successful how smart solutions where to launch kayak on windermere from where science came who solution recipe for rehydration why product marketing whom should product owner report when design and access statement required where do i start where do i begin who founded london england which device is using a motor which manager has the most ucl when design works is 1 8 miles far how much machine for ice cream where technology comes from roadmap when can you meet indoors how much science is in psychology a level what business to start when science found god how much entrepreneur make how road map how much business insurance cost where is apple research and development located what solutions are hypertonic where to start up a business