Equity Trader was asked...June 8, 2010

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@qq11, I don't think your answer is right either. The question specifically says the balance beam can only be used twice, so I assume the question is asking how to find the heaviest marble by using the beam twice, not 3 times. You simply just split the 9 marbles into groups of 3. Put two sets on each side of the balance beam, and this will tell you which set has the heavy marble. After that, just take the heavy set of 3 marbles and put 2 of them on the balance beam, and you'll know which marble is the heavy marble. Less

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Ooo and ooo and ooo. First try: Ooo vs ooo => Ooo is heavier. Now take two of those and put one on each scale. If equal than the third is heaviest. If not equal, heavier one is heaviest. OR try ooo vs. ooo. Equal. Repeat step two for the pile that is established to be Ooo. Less

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@qq : go kill yourself.....are you really thinking about sayng to put the marble in your hand?? c mon bro.......alex is right btw Less

Junior Equity Trader was asked...July 7, 2012

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Isn't it 90 + 15 = 105 degrees?

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Yea its 105 degrees

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It's 90 degrees between 9 and 6 o'clock but the hour hand will move half way towards 10. Since there's 3 hours between the 9 and 6 we can say 1 hour = 90/3 = 30. The initial 90 degrees + the additional (1/2)*30 = 105 degrees. Less

Equity Trader was asked...September 11, 2009

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20

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correction to the above, if you're writing the numbers with letters as opposed to numerically the correct answer is 10. Less

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9,29,39,49,59,69,79,89,99...19 isn't one..so 9

Equity Derivatives Trader Trainee Co-op was asked...February 18, 2011

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5/36

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5/36 is right.... Combinations that add up to six: 1 and 5, 2 and 4, 3 and 3, 4 and 2, 5 and 1. So we have 5 successes. There are 36 individual outcomes because there are 6 sides on each die and 6*6 = 36 So we have 5/36. Less

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1/6

Equity Trader was asked...October 19, 2014

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Answer is 7, the solution can be found online as this is somewhat common in interviews. Less

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Wouldnt it be 5 races? just time each of them

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Wouldn't it be 6? 5 inital races, then you take the winners of each race and race them once more Less

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Chance of 1 Heads = .5 Chance of 7 heads in a row = (.5)^7 to do this in your head think of fractions... (1/2)^7 = (1/2*1/2=1/4, * 1/2=1/8, * 1/2 = 1/16....if you do it seven times you get 1/128. so you have a better chance to pick out the penny with two heads (1/100) than to get 7 heads in a row (1/128) Less

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99 times out of 100 you take the normal penny. prob that normal penny give 7 heads in a row is 1/128. so, prob that he has special penny is 1/100 / (1/100 + 0.99*1/128) = 56.2% Less

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~56.4% that you have the 2-headed penny.

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1+2+3+4+5+6+7+8+9+10=55 55/10 = 5.5 = Average Expected Winning Price it higher then that number to be profitable Less

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Whatever will maximize the value from your customers.

Equity Prop Trader was asked...September 27, 2012

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should be 135

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Angle Problem: The hour hand is halfway between the 10 and 11 and the minute hand is on the 6, so they are 4.5 away and there are 12 total on the clock. 4.5/12 * 360 = 30*4.5 = 45*3 = 135 degrees Less

Equity Trader was asked...September 22, 2020

Equity Trader was asked...May 11, 2010

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