Heard on the Street: Quantitative Questions from Wall Street Job Interviews

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Deciding on your targets helps you with prep: some companies have different styles/rounds of interviewing, and there's no one size fits all. With that said, here are a Compare {(1)A, (3)A} with {(1)B, (3)B}. If they balance, then the odd ball is in group C. In this case, compare (3)C to (3)B. If (3)C is heavier or lighter, then comparing any 2 marbles from within (3)C immediately locates the odd one; if (3)C balances 3(B), then compare (1)C to (1)B to see whether (1)C is heavier or lighter.

A1，B3）和（B1，C3）不平衡，且（A1，B3）重（1.2解释AB不平衡所以C组整组都是平衡的，那现在有问题的在A1，B3，B1里。如果B3有问题，因为A组在1.2重于B组，所以B3轻，但是轻的B3换边后竟然会导致本边重，不合理，所以孤儿只能在A1和B1里。同时说明，要么是A1重，要么是B1轻。） Do not need any calculatiosn at all. In fact, the only reason for any calculation is if you also want to find out what the final concentrations are.

The initial concentration of alcohol in the alcohol jug equals the initial concentration of water in the water jug (at 100%). What is the relationship between the final concentrations of alcohol in the alcohol jug and water in the water jug? If the cubic room is opened up and flattened out it can be seen that the shortest path is a straight line from one corner to the other. In the un-flattened room, this straight line corresponds to two line segments that meet exactly halfway up one wall-floor or wall-wall boundary. Direct computation using Pythagoras' Theorem5 reveals that the total path length is 5 The 12 marbles appear to be identical. In fact, 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more. Note that the unusual marble may be heavier than the others, or it may be lighter; you do not know which. You are asked to both identify it and determine whether it is heavy or light.

Xinfeng Zhou - Blah Blah Blah Quant Finance Interviews. Amazing book. Especially the brainteasers and Probability section. Must do I have a revolver with six empty chambers. Watch me as I load the weapon with two contiguous rounds Split the 12 marbles into 3 groups of 4. Each group of 4 has 2 subgroups: 1 singleton and 1 triplet -> {(1)A, (3)A}, {(1)B, (3)B}, {(1)C, (3)C} The random Wall Street Oasis/QuantNet threads on these questions - here, here, here, here, here, here - One Glassdoor reviewer said that you should Forget about the green book - only do dice and card problems and scrape the whole glassdoor for Jane Street.There are two bells. One rings five times per minute, and the other rings four times per minute. If they start at the same time, how long will it be until they next ring together? There are others as well (Quadeye, Graviton, NK, APT), a few of which I applied to, but I wanted to go for an offshore role, considering how almost everyone in my year went abroad for a research intern this summer. Books