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# Interview Questions

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## Interview Questions

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Mar 4, 2012
 Suppose there's a 60% chance of rain on saturday, and a 80% chance of rain on sunday. Given that it rained over the weekend, what's the chance it rained saturday?3 AnswersUse Baye's formula: b=p(rain over weekend)=1-p(no rain over weekend)= 1-(.4*.2)=.92 a=(p rain on saturday)=.6 p(b given a)= 1 since if it rained on sautrday, it had to rain overhe weekend so p(a)*p(b given a)/p(b)=.6/.92=.65=p(a given b)=p( rain on saturday given it rained on the weekend)0.65 > 0.5 dude... think againThe first answerer is correct I think. One of the following happened: It rained on Saturday only: 0.6 * 0.2 = 0.12 It rained on Sunday only: 0.4 * 0.8 = 0.32 It rained on Saturday and Sunday: 0.6 * 0.8 = 0.48 Add these up: 0.92 total of it raining over the weekend. But the question is stated that it's given that it rained over the weekend. So: Pr(Saturday) = (0.12 + 0.48) / 0.92 = 0.6 / 0.92 = .652 (roughly 2/3)

Mar 28, 2012
 You have two decks of cards, one normal 52-card deck and one 104-card deck with double every card. Is one deck better than the other if you wanted to get two black cards in a row?3 AnswersYes, you would want to choose the 104-card deck.With 52-card, probability is 12/204, with 104-card, probability is 25/412. The latter one is bigger104 card deck has higher probability. For 104 cards: (52/104)*(51/103) = 0.24757 For 52 cards: (26/52)*(25/51) = 0.245098

### Java Developer at Knight Capital was asked...

May 12, 2010
 Given an array of N integers, find the missing integer.3 AnswersIterate through array, keeping a sum of the values. Subtract the final answer from n*(n-1)/2the answer is subtract the sum from n*(n+1)/2Is that a well-known algorithm? I don't know how you could ever have figured that out. I would have sorted the array and iterated until I got to the missing integer.

### Equity Analyst Associate at Morgan Keegan was asked...

Jul 11, 2009
 What are the three general sections of a cash flow statement2 AnswersIncome, expenses, net cash flowOperational, Financial and Investing cash flows. Also learn how to interconnect changes in the different financial statements.

Feb 16, 2010
 Nothing unexpected, most difficult was specific questions about technologies I had not worked with in the past.2 AnswersI answered honestly and said I could learn the technologyThat answer is probably too honest for more interviewers unfortunately.

Jan 21, 2012
 What is the probability of getting at least one head if you toss a coin three times?3 Answers7/81- (1/8) = 7/81-(3/8) = 5/8

### Connectivity Consultant at Convergex Group was asked...

May 23, 2012
 If the lights were turned off and you had to reach into a drawer that had 10 white socks and 10 black socks how many would you have to pull out to guarantee that you had a matching pair?3 AnswersthreeI think the correct answer is 11. Pulling out three could mean three black or three white. Pulling out 11 means, for sure, you get 10 of all the black OR white ones (since there are only 10 of either one) and 1 of the opposite ... making a pair.@Steve. A matching pair means two of the same color. When does one black and one white sock make a matching pair? If you came to work like that, I would fire you.

### Investment Banker at Nomura Securities was asked...

Oct 3, 2010
 formula wacc2 AnswersWACC = Re/(E+D) + (1-Tc)*Rd/(E+D)The previous answer is kind of confusing, so here is my attempt to clarify: WACC = (E/(E+D+P))*Re + (1-Tc)*(D/(E+D+P))*Rd + (P/(E+D+P))*Rp Where E is the market value of the firm's equity (common stock) D is the market value of the firm's debt P is the market value of the firm's preferred stock (if it has any) Tc is the corporate tax rate, because the interest paid on debt is tax-deductable WACC is also an appropriate rate at which to discount the future cash flows of the firm.