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S&T Brainteaser Help
When it comes to brainteasers, how hard can I expect them to be? With SA 2025 recruiting soon, working my way through brainteasers. I have a background in statistics, so wondering how advanced the probability brainteasers might be... anyone have an idea? This is for regular S&T not quant research or...
Answer to question isn't right maybe?
Hey guys, so I saw this on the website/linkdin. And I didn't know how to put a comment on it. But I think the answer here is wrong. In two scenarios. Firstly, if it is a roulette, than you get double your money each time you win. So the caculation would be: 0.45 * 2 (because you double your money...
Brainteaser - how much does [...] cost ?
Hello all, I am currently preparing for interviews and I found some brainteasers that I struggled to answer. I was wondering if anyone here can help me out with the question below : - How much does a 747 cost? - What is the price of a hen? bull? - How many liters does a cow produce per day?
Can you solve this PE interview brainteaser?
Imagine you have a special dollar. You can play a game with me. I'll toss a coin and if you call it right, you have two dollars; if not, you take home only one dollar. You can keep playing if you call correctly, doubling your money each time How much would you pay for the special dollar? ---Message...
Guesstimating CAGR
I am looking for guesstimating CAGR across long time horizons. eg An investment grew 16X in 25 years, what's the CAGR? I am looking for ball park figures here.
Tough GS analyst I-View Brainteaser - can you help solve it? USD 1m or GS offer?
Hi guys, a friend of mine got following interview brainteaser at a GS internship interview: If you had the choice between 1m USD in cash and an unconditional Job offer at GS - what would be the more attractive Option financially in your view? Please try to calculate an optimal solution. ---- I think...
Did I completely screw up my first interview brainteaser?
I just finished a phone call with a potential internship opportunity and can't help but think I messed up on (what should've been) an extremely easy question. Here is the scenario: You have the opportunity to play a game. This game involves a fair coin. Every time I flip the coin and you call it...
S&T 2nd round Brainteaser most people screw up!
Came across this MM S&T brainteaser and wanted to share it with you guys: You have three pancakes. One pancake is burnt on one of it's two sides. Another is burnt on both of its sides. The last one is not burnt on either of its sides. If we were to stack these three pancakes on top of each other and...
Monday Morning Braintease: thought process on goats and panthers
120 panthers and one goat are put on a magic island that only has grass. Panthers can eat grass, but they would rather eat goats. Assume: A. Each time only one panther can eat one goat, and that panther itself will become a goat after it eats the goat. B. All panthers are smart and perfectly...
The airplane, the island, and the millionaire
Alright, so a really brilliant friend of mine posed an incredibly intriguing scenario today and I don't know what the correct answer is, if there even is one. Thoughts? Here it is: An aeroplane drops a nuke on an island as part of a military test. Unbeknownst to the pilot and the military, the...
Monday Morning Braintease - Probability
I apologize for the late post, I usually like to try to get these out in the morning...hence the name. You have an object whose weight is an integer value somewhere between 1 and 100 and a balancing scale. What is the fewest number of weights you need to be guaranteed that you can correctly identify...
Monday Morning Braintease - Two Questions
Happy Monday. Let's see if you can get your brain working after the pre-4th of July weekend fun you had. Two questions for you this morning: 1 - What is the probability that the first business day of a month is a Monday? 2 - What is the greatest dollar value in coins you can have in your hand...
Monday Morning Braintease: airplane seats
There are 100 people in line to board an airplane. Each person is holding a ticket corresponding to both his place in line and his seat (i.e. Person 1 is supposed to sit in Seat 1, Person 2 is supposed to sit in Seat 2, etc.). All of the people in line are normal, except for Person 1, who is an...
Monday Morning Braintease (2 of 2)
A Saudi prince tells his two sons to race their horses to a distant city to see who will inherit his fortune. The one whose horse is slower will win. The brothers, after wandering aimlessly for days, ask a wise man for advise. After hearing the advice they jump on the horses and race as fast as they...
Monday Morning Braintease (1 of 2)
An army tank is crossing a 3 mile bridge that can only support 40,000 pounds and that's exactly how much the tank weighs. Halfway across the bridge a 2 ounce bird lands on the tank, but the bridge doesn't collapse. Why not? Show thought process.
Monday Morning Braintease: golf balls
You have 100 golf balls (50 yellow balls and 50 white balls) and 2 buckets. How do you divide the balls into the two buckets so as to maximize the probability of selecting a yellow ball if 1 ball is chosen from 1 of the buckets at random? What is the percentage? Clarification: the bucket is chosen...
Monday Morning Braintease (the original)
Four bankers, Al, Bob, Cal and Dave need to get across a river. The only way to cross the river is by an old bridge, which holds at most 2 people at a time. Being dark, they can't cross the bridge without a flashlight, of which they only have one. So each pair can only walk at the speed of the...
Brainteaser Tuesday
So it’s Tuesday and I’m guessing you guys are either burned out from modeling or bored out of skulls editing pitch books so I thought we’d play a little game. I know you’ve done this before, so you all know the drill: I post a brainteaser , you answer it, then you post yours for everyone...
Monday Morning Braintease: clock hands
Monday again, shit. If you look at a clock and the time is 9:45, what is the angle between the hour and the minute hands? Show thought process.
Monday Braintease
A 10x10x10 rubiks cube is completely submerged in a bucked of paint. How many cubes do not have any sides covered in paint?
Best Interview Prep
http://www.nydailynews.com/life-style/health/beer… So apparently research shows that not being sober will help your problem solving skills, but lower performance with memory tasks. Article goes over an interesting study with brainteasers on a decent sample. Anyone taken a shot or had a pint before...
How to polish a turd?
Hey, how do you guys deal with situation in which you have no clue what the answer could be. Obviously, most of the questions can be approached logically but what about the cube root of a number or the last 4 digits x^81. Many thanks!
Do you know algebra?
So it seems that there are some math people around. To follow up on http://www.wallstreetoasis.com/forums/harder- brainteaser -than-the-coin-flip here is another one: Given: a^2+b^2=c^2+d^2 a^3+b^3=c^3+d^3 Show that: a+b=c+d Requires middle school math, but sure can ruin an interview. As before, SBs...
Harder brainteaser than the coin flip
Suppose X ~ Normal(0; 1) and Y = X + epsilon, where epsilon ~ Normal(0; sigma^2) and epsilon is independent of X. Conditional on observing Y , what is the distribution of X? SBs for 1st correct answer Edit - this is in response to //www.wallstreetoasis.com/forums/the-hardest- brainteaser...
Crazy D.E. Shaw phone interview question -- Help!
I had a first round phone interview for a quant trader position with D.E. Shaw today, and got stumped on what seems like a pretty simple probability question (see below). Do any of you know how to figure it out? I think it deals with combinations. There are n socks in a closet, and 3 of them are...
Brainteaser Approach?
Heres the question: Whats the difference between me (interviewer) and you(Interviewee) in light years? Best approach?
How many cabs in NYC question?
Hi guys, I was asked the question: How many cabs are there in NYC? I was wondering how you would all approach it! Thanks.
Brainteaser Interview Q - How many bars are there in the IU.S.?
I was looking at all kinds of brainteaser questions, one of them was "How many bars are there in the U.S.?" How would you guys approach this question? Pls no answers like, 'i'll look it up on google' or any of those sorts.
Brainteaser help
I am having some trouble with this brainteaser from Crack 's book. Here is the question: You are bidding for a firm whose unknown true value is uniformly distributed between 0 and 1. Although you do not know the true value S of the firm, you do know that as soon as people learn you made a bid the...
Solve this question
Currency Lending Rate Borrowing Rate US Currency ($) 6.73% 7.20% Foreign Currency 6.80% 7.28% Milly Bank can borrow either $20 million or FC20 million. The current spot rate of the FC is $1.13. Furthermore, Milly Bank expects the spot rate of the FC to be $1.10 in 90 days. What is Milly Bank’s...
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