Trayport Exploratory Tester interview questions

Written test followed by interview by 2 persons. For exploratory (manual) tester you are asked to review some C# code on paper, write code to parse a string of roman numbers, sorting. Also usual google-like tasks: "you have boxes of red, blue, mixed marbles, all labelled incorrectly. How many balls you need to take out to find correct labelling?" Some common computer questions on networking, desktop applications errors, etc