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来发一个DRW quant OA面经。30min4道题。
1. Let S be the subset of the plane defined by{(x,y)| |x|-|y| < 1 & |y| < 1}. What is the area of S?
2. You roll 4 dices. What is the probability thatthe difference between the high number and the low number is 5, to 3trices are there with determinantequal to 1 or -1 that map the cube with vertices at (±1,±1,±1) toitself? |