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Five Rings Captial (quant)

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liybu 发表于 2017-11-10 23:27:41 | 显示全部楼层 |阅读模式
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2017(7-9月) 金工类 博士 全职@Five Rings Captial - 校园招聘会 - 技术电面  | Fail | fresh grad应届毕业生

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Five Rings Captial, quant associate.本文原创自1point3acres论坛
submit resume on campus


Phone 1 HR screen:
1. work me through resume, explain my work, the visa, why this company, any pending offer
2. quick math/calculation questions with timing of 15 seconds:
square root of 51, ln(514), what is the first number that has 100 digits in its factorials (n! has 100 digits, first n)
the mass of griaffe, how many bottle drinks do people in US drink per year, how many miles do people in US drive per year
the population of us, GDP of US, the mass of the earth (can be found in galssdoor)


Phone 2:
1. X and Y, iid, follow N(u,sigma), what is the distribution of X+Y?
Follow up: what if X and Y are correlated instead of iid
2. a bag of 10 coins, 9 of them are fair, 1 is unfair that has 2 Heads; you randomly pick 1 coin from  the bag and flip it 2 times
you see 2 Heads, what is the probability that coin is unfair?
Follow up: what if you do not know the state of unfair coin, that is the unfair coin has equal chance to have 2 Heads or 2 Tails,
do the same process, what is the probability of getting the unfair coin?
. from: 1point3acres

Phone 3:
X and Y, iid, follow N(0,1)
1. P(X>Y)
2. P(X>2Y)
3. P(0<X/Y<1)
4. P(1/3 < (X/Y)^2 <3)

++++++
comment:第三轮 3 和4 题 答得不好, 后来问了理论物理大神才知 可以用2维X-Y坐标 X/Y 的分布只是和他们与X轴的角度有关, 可以快速解答不需要积分
大神拿了300K的five rings captial package
他们面试到onsite 只问math,probability and stats, no coding
but they only hire 2 People this year

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wenyuz 发表于 2017-11-28 14:42:54 | 显示全部楼层
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what is the first number that has 100 digits in its factorials? LZ这个怎么做啊?
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