Princeton MFin Math Assessment

1月6号做了math assessment, 都是单选题形式 11道题1小时 Hackerrank形式
分享几道原题：

• a,b are both positive integers, a+2 is mutiple times of b, b+2 is multiple times of a, what's the biggest possible value of a+b？ (2/4/6/10/14) Answer: 10
• There is a desert which can be crossed only by walking and this takes 8 days. The explorers of the desert can carry at most 5 days' water and food. If they want, they can take helpers with them. Each helper can also carry at most 5 days' supply. What is the minimum number of helpers that an explorer need to cross the desert? (1/2/3/4/5) Answer:3
• stochastic calculus: what's the integral of a brownian motion from 0 to t?  B(s)ds
• What's the result of 3*3 matrix A to the power of 2023? A^2023 A: (-1,-1,-1,0,1,0,0,0,1)          Answer: A itself

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