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by tetrabit
April 12th, 2008, 5:40 pm
Forum: Careers Forum
Topic: Bear Stearns Job Situation
Replies: 14
Views: 57931

Bear Stearns Job Situation

<t>QuoteOriginally posted by: ppauperQuoteOriginally posted by: tetrabitQuoteOriginally posted by: BroardviewQuoteOriginally posted by: brotherbear1220He's a smart kid, has a bachelor's (Phi Beta Kappa) and a master's from Berkeley, will have an MSc. from the LSE in a couple of months, fluently spea...
by tetrabit
April 12th, 2008, 2:01 am
Forum: Careers Forum
Topic: Bear Stearns Job Situation
Replies: 14
Views: 57931

Bear Stearns Job Situation

<t>QuoteOriginally posted by: BroardviewQuoteOriginally posted by: brotherbear1220He's a smart kid, has a bachelor's (Phi Beta Kappa) and a master's from Berkeley, will have an MSc. from the LSE in a couple of months, fluently speaks English and Mandarin, and is a US citizen.Thanks!Does your friend ...
by tetrabit
April 3rd, 2008, 2:51 am
Forum: Brainteaser Forum
Topic: two interview questions
Replies: 8
Views: 60909

two interview questions

QuoteOriginally posted by: daydayupDoes anyone pay attention to the last part of question (2)? What is the errow incurred in approximating a finite harmonic series by log?Google can answer that one, so where's the fun?
by tetrabit
April 1st, 2008, 12:43 pm
Forum: Brainteaser Forum
Topic: GS brainteaser
Replies: 22
Views: 67844

GS brainteaser

QuoteOriginally posted by: yuryrsorry if I am being dumb but what's "normal" PDE?I think he means "normal" as in without anything stochastic.
by tetrabit
April 1st, 2008, 5:04 am
Forum: Brainteaser Forum
Topic: two interview questions
Replies: 8
Views: 60909

two interview questions

<t>The second question is a standard expectations calculation: Let Ei be the expected number of balls drawn after the (i-1)th until we get the next unmarked one. Then Ei = 100/(101-i). Summation is 100 times the harmonic series truncated at some point.The first one is interesting. Beyond the simple ...
by tetrabit
March 29th, 2008, 7:47 pm
Forum: Brainteaser Forum
Topic: high school problem
Replies: 13
Views: 61228

high school problem

QuoteOriginally posted by: bilbo1408Why would 1234 be more probable than 1134? Because of the order-not-important part. 1234 has 24 permutations, 1134 has only 12.I agree with CommQuant, problems like this don't usually have neat solutions.
by tetrabit
March 13th, 2008, 4:58 pm
Forum: Brainteaser Forum
Topic: 2 goals? 3 goals?
Replies: 13
Views: 61218

2 goals? 3 goals?

<t>I'm interpreting this to mean "propose a reasonable model for the problem" as otherwise it's too ill defined.So let's say we assume a Poisson distribution for the number of goals each team has. Let the parameters be a,b for the first and second team resp. Then a simple calculation gives the proba...
by tetrabit
March 8th, 2008, 1:42 am
Forum: Careers Forum
Topic: Is it a mistake on this title?
Replies: 8
Views: 59577

Is it a mistake on this title?

It could be that they are using the term in the general sense (http://en.wikipedia.org/wiki/Quantitative_analyst) and not as the exact job title.
by tetrabit
March 7th, 2008, 8:07 pm
Forum: Brainteaser Forum
Topic: Average waiting time at a bus stop
Replies: 14
Views: 71657

Average waiting time at a bus stop

<t>Let's say we are in the interval (0,30) with bus #1 at t=10 and bus 2 at t=30. If you've been waiting 9 minutes you got there some time in (0,1) union (10,21). In the first case, you still have to wait for 1-t minutes, in the second case for 21-t minutes. Integration gives 61/12 minutes. That see...
by tetrabit
March 7th, 2008, 8:42 am
Forum: Brainteaser Forum
Topic: two problems from probability exam
Replies: 20
Views: 68202

two problems from probability exam

<t>QuoteOriginally posted by: CommodityQuantHowever, on 1, wrmann seems to have made just a picky response. Yes, there is other information given (that the distribution vanishes outside [a,b]) but, of course, my point stands very well because this other information is not remotely powerful enough to...
by tetrabit
February 27th, 2008, 6:41 pm
Forum: Brainteaser Forum
Topic: Splitting and adding
Replies: 3
Views: 60081

Splitting and adding

<t>Nice solution cm! Here is another, more combinatorial argument: Let C(n) be the number of ways of choosing 2 things out of a set of n. Of course, C(n)=n(n-1)/2. But we can also calculate C(n) thusly: partition the set into two subsets, say A and B, of sizes m and n-m resp. Then we can pick 2 elem...
by tetrabit
February 27th, 2008, 2:29 am
Forum: Brainteaser Forum
Topic: Splitting and adding
Replies: 3
Views: 60081

Splitting and adding

<t>Here is a boring solution. Let S(n) be the sum you get starting from n. We claim that S(n)=n(n-1)/2. Proof is by induction: S(2)=1 is obvious and for any larger n and 0<m<n, S(n)=m(n-m)+S(m)+S(n-m) if we break n into m and n-m on the first step. But a simple calculation shows that the right hand ...
by tetrabit
February 12th, 2008, 6:29 pm
Forum: Careers Forum
Topic: dealing with headhunter
Replies: 31
Views: 65119

dealing with headhunter

In my (very limited) experience, that seems ok. Knowing about interview questions lets them figure out what the employer's expectations are and how well you might fit them. Most HHs prefer to have all communication go via them, probably to make sure they get paid.
by tetrabit
January 31st, 2008, 1:48 pm
Forum: Brainteaser Forum
Topic: Ruin probability
Replies: 5
Views: 62066

Ruin probability

Are we allowed to assume x,y are integers?
by tetrabit
January 28th, 2008, 6:40 pm
Forum: Careers Forum
Topic: Quantitative Exam at Credit Suisse
Replies: 78
Views: 88518

Quantitative Exam at Credit Suisse

The description in this thread is pretty accurate. PM me if you need more details.
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