Trader Assistant Internship Interview Questions | Glassdoor

# Trader Assistant Internship Interview Questions

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Trader assistant internship interview questions shared by candidates

## Top Interview Questions

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Feb 26, 2010

### Assistant Trader Internship at Susquehanna International Group was asked...

Feb 7, 2011
 We each flip three fair coins. I offer to pay you \$1 if we do not get the same amount of heads, if you agree to pay me \$2 if we do (get the same amount of heads). Will you agree to play this game? 5 Answers Play the game. EV = 1/16. Screwed up again, EV is -1/4, don't play Agreed. EV is - 0.25 Show More Responses would you mind sharing the math behind the answer Rob. Thank you 1/2^6 + 9/2^6 + 9/2^6 + 1/2^6 = 20/64 the probability to get same number of heads. Expected value : 20/64 X (-2) + 44*/64 * (1) = 1/16 play the game

### Assistant Trader Summer Internship at Jane Street was asked...

Feb 26, 2010
 How many digits are there in 2^50? 5 Answers log2(2^50) / log2(10) = 50 / 3.3 ~= 15 2^50 / 10 = 16 * 2^46 *1.6 16 digits: 2^50 = (2^10)^5 = 1024^5 Show More Responses every 3 powers of 2 the number of digits increases by 1. 50/3 = 16.67, so there are 16 digits. 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.

### Trader Assistant Internship at DRW was asked...

Feb 25, 2010
 17*13 3 Answers (17*10) = 170 + (17*2) = 204 + 17 = 221 Another easy way to do this is a trick with multiplying numbers between 10 and 19. Add the 2nd digit of smaller number to first and add a 0 at end, so 17+3 = 20+0 = 200 Add the product of the two 2nd digits, so 7*3 = 21 = 221 15 is exactly between 17 and 13. So you can do (15 + 2)*(15 - 2) = difference of two squares = 225 - 4 = 221.

### Trader Assistant Internship at DRW was asked...

Feb 25, 2010
 19*21 2 Answers (20-1)*(20+1)=20^2-1=399 I would do 19 x 20 = 380 380 + 19 = 399 (to return to the original 19 x 21)

### Assistant Trader Summer Internship at Jane Street was asked...

Feb 17, 2014
 A survey is given to all passengers on a number of different planes. The survey asks each person how full their plane was. The people answer honestly. If 50% of people claim that their plane was 80% full, while the other 50% claim that their plane was 20% full, how full was the average plane? 2 Answers 32%, I think? I totally blanked during the interview and it took me a while to get. Let's say each plane holds 100 people. If someone is on a plane which is 80% full, then each of the 80 passengers will say the same thing. Similarly, if someone is on a plane which is 20% full, then each of the 20 passengers say the same thing. We want the number of people who say 80% to be equal to the number of people who say 20%, so for each plane which says 80% there must be four which say 20%. The average is therefore (1/5)80% + (4/5)20% = 32%.

### Trader Assistant Internship at Susquehanna International Group was asked...

Jan 26, 2012
 Five people with different ages are going to sit in a round table. What is the probability that they sit in ascending or descending age order? 2 Answers 1/12 Number of ways to seat that satisfies the requirements: 1) seat the oldest person in a seat, notice that seats are then distinguishable. 2) seat the rest of (N-1) people either in ascending or descending order of age. Hence: 1*2 Number of ways to seat N people 1) the same as 1 2) permutation of the rest Hence (N-1)! In sum, result = 2/(N-1)!=2/4!=1/12

### Trader Assistant Internship - New York at DRW was asked...

Feb 10, 2011
 So you said that American options are worth more than European options, do you know why? (Proceeds to test and show me)

### Trader Assistant Internship - New York at DRW was asked...

Feb 10, 2011
 Tell me about your last summer experience.

### Trader Assistant Internship - New York at DRW was asked...

Feb 10, 2011
 Why do you want to be a trader?
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