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by yegulalp
August 27th, 2012, 12:21 pm
Forum: Brainteaser Forum
Topic: The Mysterious Islands
Replies: 18
Views: 14572

The Mysterious Islands

Initial distribution is:70 x 1 year20 x 2 years5 x 3 years2 x 4 years3 x 9 years
by yegulalp
July 11th, 2012, 11:26 am
Forum: Brainteaser Forum
Topic: an interview question, the probability of picking a seat randomly in a stadium
Replies: 12
Views: 24851

an interview question, the probability of picking a seat randomly in a stadium

<t> The correct answer depends on the process used to remove the 990 chairs. There are two reasonable possibilities:1. The chairs were removed by someone who knows the location of the prize, and they are deliberately not removing the prize chair.2. The chairs were removed at random (or by someone wh...
by yegulalp
June 18th, 2012, 12:26 pm
Forum: Brainteaser Forum
Topic: Gaussian conditional probability
Replies: 11
Views: 15064

Gaussian conditional probability

Answer of 3/4 also holds if we relax to X, Y iid and symmetric around 0 (but not necessarily normal). I.e. P(X>c) = P(X<-c) for any c.
by yegulalp
December 30th, 2011, 2:43 pm
Forum: Brainteaser Forum
Topic: Russian Roulette (Difficult Version)
Replies: 24
Views: 20275

Russian Roulette (Difficult Version)

<t>I have some further analytic (exact) results. Some of the derivations are messy so I have not included them here. All results verified against exact enumeration for n up to 7.After 1 round of shooting starting with n players, expected number of players left is exactly n * ((n-2)/(n-1))^(n-1). As ...
by yegulalp
February 1st, 2010, 12:46 pm
Forum: Careers Forum
Topic: is it too old to become a quant
Replies: 32
Views: 42062

is it too old to become a quant

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