Morgan Stanley Interview Question: You have a deck of 52 cards, ... | Glassdoor

Interview Question

Quantitative Analyst Interview London, England (UK)

You have a deck of 52 cards, and you keep taking pairs of

  cards out of the deck. if a pair of cards are both red, then you win that pair; if a pair of cards are both black, then I win that pair; if a pair of cards has one red and one black, then it's discarded. If, after going through the whole deck, you have more pairs than I do, then you win $1, and if I have more pairs than you do, I win $1. What is the value of this game in the long run?

Interview Answer

7 Answers



optimus prime on Jul 8, 2012

0 lol. nice one

xeesus on Aug 14, 2012

by symmetry, probability of losing = probability of winning

therefore, -1p(lose)+1p(win)=0.

done, ko, finished, fiendin'

yasir shihabudeen on Feb 18, 2014

No one bothered to ask if you're paying the loser -- e.g. when you win, you get $1, but when you lose, are you losing $1? It's not clear from the question above, though the interviewer may have been more specific.

J D on Mar 31, 2014

good point J.D

It can either be 0 or 0.5 depending on how you interpret the question

rd on Mar 19, 2015

I think you will always have the same number of pairs

Anonymous on Jan 16, 2017

Why is it 0 for us dumb people pls

Anonymous on Jul 20, 2019

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