Jane Street Interview Question: How many digits are there in ... | Glassdoor

Interview Question

Assistant Trader Summer Internship Interview(Student Candidate) New York, NY

How many digits are there in 2^50?

Answer

Interview Answer

5 Answers

2

log2(2^50) / log2(10) = 50 / 3.3 ~= 15

Anonymous on Mar 17, 2010
0

2^50 / 10 = 16 * 2^46 *1.6

Anonymous on Aug 30, 2010
6

16 digits: 2^50 = (2^10)^5 = 1024^5

Anonymous on Oct 2, 2010
6

every 3 powers of 2 the number of digits increases by 1. 50/3 = 16.67, so there are 16 digits.

willie on Apr 29, 2011
0

With these brain teasers, is it allowed to use scratch paper?

Is there a favored approach between trying to work quickly and mentally as opposed to thoroughly and methodically?

I can see the pro's and con's of both, and I'm just curious whether I should practice one way or another.

Curious on Aug 8, 2011

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