EhCafe » karaki http://www.EhCafe.com Chit-chat about tech, life, and fun, eh? Thu, 06 May 2010 22:44:14 +0000 http://wordpress.org/?v=2.9.1 en hourly 1 The “Why didn’t I think of that Invention of the Year” http://www.EhCafe.com/2009/12/29/the-why-didn%e2%80%99t-i-think-of-that-invention-of-the-year/ http://www.EhCafe.com/2009/12/29/the-why-didn%e2%80%99t-i-think-of-that-invention-of-the-year/#comments Tue, 29 Dec 2009 21:37:01 +0000 karaki http://www.EhCafe.com/?p=303 Introducing the dreamie:

https://www.buydreamie.com/

]]> http://www.EhCafe.com/2009/12/29/the-why-didn%e2%80%99t-i-think-of-that-invention-of-the-year/feed/ 0 Wall Street Interview Questions http://www.EhCafe.com/2009/12/29/wall-street-interview-questions/ http://www.EhCafe.com/2009/12/29/wall-street-interview-questions/#comments Tue, 29 Dec 2009 21:06:45 +0000 karaki http://www.EhCafe.com/?p=302 I am graduating soon and I started interviewing with the Big I banks for a Quant Strategist position. I had close to 8 phone interviews over the past 3 weeks all with Russian Theoretical physicists. Being a mere master’s student, you can imagine how intimidating it was. Anyways,  I thought it would be fun to share some of the insanity I’ve seen:

One liners:

Question 1: How many digits does 2^71 has? How confident you are in your answer?

Question 2: How many primes are there less than 1000? Provide a confidence interval.

More involved games:

Question 3:  A frog sits on an infinite line. It can jump in steps of 2 to the right and in steps of 1 to the left ( both with probability of 1/2).  What is the probability that it returns its initial position.

Question 4:  You have a standard deck of cards with 26 reds and 26 blacks placed on a table face down.  You and a player take  turns flipping the cards , one by one, if it’s red you win 1 dollar if black you loose 1 dollar. What is the optimal strategy to play this game? i.e When should you stop.

I have plently more if folks are interested.

Surprisingly , I managed to do well . I’ll find out in 2 weeks if I got the job :)

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