老师好，R30书后题，第35题，为什么要加上这50million? 这50没反应在FCFF的 3226里面吗？

or a mortgage pass-through security, which of the following risks most likely increases as interest rates decline? A Balloon B Extension C Contraction 老师，这个题A选项为什么错误，顺遍麻烦再把整个题讲解下，谢谢

开三次根号计算器怎么算呢

老师 请问这道题 如果我是算出现在underlying国债的clean price后直接除以CF后得出的新的期货价格，用这个计算出的期货价格和市场上目前的期货价格做比较可以吗？ 但是这样算出来差额和答案中用国债价格计算套利premium的结果并不一样。

这套题，老师说出的难一点，答案会给一个+490，一个-490。所以，仅这道题而言，如果答案中既有+490，又有-490，应该选哪个

Given the following spot and forward rates: Current 1-year spot rate is 5.4%. One-year forward rate one year from today is 7.52%. One-year forward rare two years from today is 12.56%. One-year forward rate three years from today is 13.3%. The value of a 4-year, 10% annual-pay, $1,000 par value bond is closest to: A $996. B $1022.62. C $1,086. 这道题如果用 金融计算器该怎么按，？每期的收益都不一样

10题. BSM MODEL的假设是price对数分布，return正态分布吗？

老师，题干只说样本容量大，没说均值和方差已知啊

老师，你好，还是不明白这题为什么用after fee而不能用before fee? 为什么Management and incentive fees are calculated independently 一定是在after fee的基础上？

In assigning credit ratings, the practice of notching by the rating agencies is least likely used to quantify the: A probability of default. B priority of payment in the event of default. C potential severity of loss in the event of default. 老师，能否详细解析下这道题，有点弄不明白