You need to test a web app across different configurations: four browsers, three operating systems, three interface languages and two pricing plans. Testing every combination means seventy-two of them. How would you reduce the number of tests?
~4 min by voice
How to approach it
The interviewer wants to see whether you know combinatorial test design techniques, above all pairwise, and can apply them sensibly: understand why the method works, where it's weak, and how to tailor the set to the real product.
The interviewer will ask this question and listen. Think out loud and ask for a hint if you need one. When you're done, pause or tap “That's my answer”. In about a minute, your score and the points you covered show up here.