Susquehanna International Group, LLP

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Susquehanna International Group, LLP Assistant Trader Intern Interview Question (student candidate)

I interviewed in Bala Cynwyd, PA and was asked:
"Five guys, all of different ages enter a bar and take a seat at a round table. What is the probability that they are seated in ascending order of age? (clockwise or counter-clockwise)"
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Answer

Part of a Assistant Trader Intern Interview Review - one of 250 Susquehanna International Group, LLP Interview Reviews

Answers & Comments

1
of 3
votes
5! or 120 total seating positions. 5 possible starting positions because the table is round. 2 possible directions.

This makes 10 arrangements that fulfill the prompt, ie P = 10/5! = 1/12
- Interview Candidate on Feb 18, 2011
1
of 1
vote
Make the youngest person a fixed point. The second youngest can sit on 2 seats in 4 remaining seats (left or right of the youngest). The third youngest can sit on 1 seat in the 3 remaining because we defined ordered by previous step. Fourth youngest can sit on 1/2. Last person 1/1

2/4*1/3*1/2=1/12
- Anonymous on Nov 09, 2011

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