押题52，第一个为什么也对，pay for realized correlation ,付出浮动，在相关性增加时，应该是亏钱的呀？

Q37, why both answer b and C said correlation equal to 1 but ans b can underestimate risk but ans C I ill overestimate risk? Pls explain in Chinese

Q23 is BSM can only equal to lognormal approach but not risk neutral one?

If after I times the formula the answer is negative it means it is a loss right?

Q21 if four stocks have different price , should I sell the most higher marginal var or sell The highest component var?

Why don’t we first pay for the principal 80m?? Where is it

老师，那这样Hazard rate不是直接近似等于PD？

Can u teach me how to change back to normal? Now my calculator only show 兩小數位

请问老师C和D为什么是错的？以及，D的against是否定的意思吗？against我记得有反对还有依靠就是about的意思。请问如何理解这道题？谢谢

请问老师44题。我没有看懂解析前两步求Rp和Rb是为什么？这两步请问有必要计算吗？谢谢