Help with this interview question

You have the option to bet whether or not there are two dogs in the world with the same number of hairs. would you take that bet?

I answered I would take a sample of 1,000 dogs, find the standard deviation, and do a p test to gain conviction. what would you do?

4 Comments
 

If you have 'n' items and 'm' containers, where 'n' is greater than 'm', then at least one container must hold more than one item. This is the Pigeonhole Principle, dog hairs don't go to infinity, lets assume 10M. since there are way more dogs than 10M in the world, its a given that at least one of them has to match hair counts. Also... arent there hairless dogs, at least in the colloquial sense? 
 

 

Looks like someone paid good attention in CIS 160 or whatever your school's version of it was. Elite approach and answer to the question - thanks for jogging up those memories for me too.

 

I started ok the later end of that. Say there are 50M dogs on the world, it would only take 1 orphan disease case to cause dogs to grow no hair. A certain number of dogs have to inevitably have the disease as well. Love your approach!

 

Ea reprehenderit quia et sint assumenda. Voluptatem architecto laborum dolorem. Ut quia animi et sunt reprehenderit consequuntur.

Rem impedit quaerat vel aliquid quia modi. Dolor deleniti voluptas voluptas natus necessitatibus molestiae dicta quia. Id dicta nesciunt fugit perferendis repudiandae eligendi.

Aliquam quam nostrum exercitationem quia. Nulla et enim soluta minus. Deleniti provident officiis consequatur et facere voluptatem ut est.

Career Advancement Opportunities

October 2026 Investment Banking

  • Evercore 01 99.5%
  • Moelis & Company 01 99.0%
  • JPMorgan 01 98.4%
  • Guggenheim Partners 02 97.9%
  • Morgan Stanley 06 97.4%

Overall Employee Satisfaction

October 2026 Investment Banking

  • Moelis & Company No 99.5%
  • Morgan Stanley 02 99.0%
  • Evercore 01 98.4%
  • Banco Santander 02 97.9%
  • BMO Capital Markets 13 97.4%

Professional Growth Opportunities

October 2026 Investment Banking

  • Evercore 01 99.5%
  • Moelis & Company 01 99.0%
  • Morgan Stanley 05 98.4%
  • Goldman Sachs 01 97.9%
  • JPMorgan No 97.4%

Total Avg Compensation

October 2026 Investment Banking

  • Vice President (16) $429
  • Associates (57) $264
  • 3rd+ Year Analyst (8) $210
  • 2nd Year Analyst (28) $184
  • Intern/Summer Associate (16) $161
  • 1st Year Analyst (84) $151
  • Intern/Summer Analyst (76) $101
notes
16 IB Interviews Notes

“... there’s no excuse to not take advantage of the resources out there available to you. Best value for your $ are the...”

Leaderboard

1
redever's picture
redever
99.2
2
kanon's picture
kanon
99.0
3
BankonBanking's picture
BankonBanking
99.0
4
Secyh62's picture
Secyh62
99.0
5
dosk17's picture
dosk17
98.9
6
CompBanker's picture
CompBanker
98.9
7
GameTheory's picture
GameTheory
98.9
8
Betsy Massar's picture
Betsy Massar
98.9
9
DrApeman's picture
DrApeman
98.9
10
bolo up's picture
bolo up
98.8
success
From 10 rejections to 1 dream investment banking internship

“... I believe it was the single biggest reason why I ended up with an offer...”