Goldman Sachs Interview Question for Interns


Country: United States
Interview Type: Written Test




Comment hidden because of low score. Click to expand.
8
of 8 vote

Prob.(successful first launch) = 0.8
T(successful first launch) = K - C

Prob.(successful second launch) = (0.2)(0.8)
T(successful second launch) = K+(K/3)-C

Prob.(successful third launch) = (0.2)^2(0.8)
T(successful second launch) = K+(2K/3)-C

Prob.(successful fourth launch) = (0.2)^3(0.8)
T(successful second launch) = K+(3K/3)-C

Prob.(successful fifth launch) = (0.2)^4(0.8)
T(successful second launch) = K+(4K/3)-C

Prob.(unsuccessful experiment) = (0.2)^5
T(successful second launch) = K+(4K/3)

This is the probability distribution of T:

Prob.(T = K - C) = 0.8
Prob.(T = 4K/3 - C) = 0.16
Prob.(T = 5K/3 - C) = 0.032
Prob.(T = 6K/3 - C) = 0.0064
Prob.(T = 7K/3 - C) = 0.00128
Prob.(T = 7K/3) = 0.00032

- anotherguy September 14, 2013 | Flag Reply
Comment hidden because of low score. Click to expand.
-1
of 1 vote

why K-C?why n't K+C?
bco'z there's is additional gain of C dollars.

- anshul221 September 14, 2013 | Flag
Comment hidden because of low score. Click to expand.
0
of 0 votes

T is the cost, losses must be added and gains must be subtracted from cost. So we add K, K/3 and subtract C!!

- anotherguy September 15, 2013 | Flag
Comment hidden because of low score. Click to expand.
0
of 0 vote

Correct. But it will extend to infinity. So you have to take next trial into account. Also all p's should add to 1

- Waleed January 01, 2015 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

(.8)(K-C)(.2)^(n-1)
here n is the Nth attempt to launch

- aditya.eagle059 April 02, 2015 | Flag Reply
Comment hidden because of low score. Click to expand.
-1
of 1 vote

E(T) = sum{(k - k / 3 * (i - 1) - C) * p^i * (1-p) ^ (i - 1), i = 1, 2, 3, 4} + (k - k * 4 / 3 - 0) * (1 - p)^5

- wjian@yahoo-inc.com September 21, 2014 | Flag Reply


Add a Comment
Name:

Writing Code? Surround your code with {{{ and }}} to preserve whitespace.

Books

is a comprehensive book on getting a job at a top tech company, while focuses on dev interviews and does this for PMs.

Learn More

Videos

CareerCup's interview videos give you a real-life look at technical interviews. In these unscripted videos, watch how other candidates handle tough questions and how the interviewer thinks about their performance.

Learn More

Resume Review

Most engineers make critical mistakes on their resumes -- we can fix your resume with our custom resume review service. And, we use fellow engineers as our resume reviewers, so you can be sure that we "get" what you're saying.

Learn More

Mock Interviews

Our Mock Interviews will be conducted "in character" just like a real interview, and can focus on whatever topics you want. All our interviewers have worked for Microsoft, Google or Amazon, you know you'll get a true-to-life experience.

Learn More