IMO that's not a good interview question even f2f, let alone on email. As an interviewer I would learn nothing from that, and I agree it's unreasonable to give

IMO that's not a good interview question even f2f, let alone on email. As an interviewer I would learn nothing from that, and I agree it's unreasonable to give an interviewee homework. As far as I know, that is not SOP for FANG interviews.