arrowq 发表于 2012-7-22 21:27 
嗯嗯,知道那个的,但是那个也不是二叉树,应该和sample15题无关吧
B-D-T model is path dependent, so the payments at year 4 all can be assumed as 1. You just need to discount values from t=3 to t=0. All steps are clear there and easier than ASM currency B-D-T models.