Sample Question #222 (mathematics – stochastics)
How would you prove that the probability of a random walk hitting any arbitrary number is 1?
(Hint: when you’re asked "how would you prove…", you’re expected to give a sketch of a proof, not the proof itself. Some interviewers would actually be pissed if you gave a formal proof, believing you didn’t understand what they were looking for. So, always answer the question in the form the interviewer wants — and this means you must listen to the questioning very carefully.)