1a) A bus runs on a loop. It takes to the bus 10min to complete the loop. You go to the bus stop at random times, what's the expected time you'll be waiting for the bus?
1b) Along the way the bus driver stops for 10 min with a 50% chance. For how long you wait now?
2) There's a rounded table, you wanna place three legs randomly, what's the chance the table stands?
I applied online. The process took 4 weeks. I interviewed at Jane Street (Berkeley, CA) in Sep 2022
Interview
Math Puzzles and brainteasers for the first interview. The second interview is about coding questions in any language you choose. It is over the phone and with a coderpad software.
I applied through college or university. I interviewed at Jane Street
Interview
Only made it to phone interview, interviewer is nice and professional. Should have been more prepared to not waste the opportunity. Got interview through campus recruitment. Never knew this firm existed until I applied.
30 min - 1 hour phone interview. The interviewer asked 2 brainteaser/ probability questions that were reasonable in difficulty (not crazy). Interviewer was kind and helps if you make a silly mistake.