Round 1 Throw Back

Kind of delay of 5 minutes.

Say Hi. My display on the screen froze there with my eyes closed. There is always some problem with my Skype on Mac.

To sum up, all questions were practiced before, they even did not change the numbers and the assumption of the questions.

Directly go to Brain teaser. No further chit chat. Although think the bad effect of listening clearly the problems, still did not get used to the bad Skype condition.

1. 30 balloons, it supposed to spend 5/3n to buy two balloons and I miscalculated as three. It is a mistake that caused by nervous. Right answer at the end.

2. calculus, ds/dt vs dr/dt. Mistook the unit as m/sec, the interview corrected me as m^2/sec. Really focus the details.

3. 100 cards, randomly pick 4 and order them ascendingly. Quick and Accurate answer. Kinde adapt to the conversation quality and calm myself down.

4.Ask how do you know about options? Poor and stupid me said, not good. Can I be even more stupid?

Ask the delta of ATM put. I answered by quoting the BS equation. Interview said a intuitive and much simpler way by seeing the distribution plot.

5. Ask how to hedge the long position in a put option with underlying asset. If price goes down, what are we supposed to do? Hints are given and quite useful.

Really nice guy. Poor me, poor running nose.

Got email 7 hours later for the second round.