问题如下图：
选项：
A. 
B. 
C. 
解释：
您好，请问这道题的公式是什么呢？哪个知识点？
请问为什么No 3–2 cannot rivefrom No 2–2？
No 4–1 shoulequto No 4–5 multipliee0.4. No 2–2 approximates the implieone-yeforwarrate two yefrom now. C is correct. Because No 2–2 is the mile no rate in Ye2, it will close to the implieone-yeforwarrate two yefrom now (rivefrom the spot curve). No 4–1 shoulequto the proof No 4–5 ane0.8e^{0.8}e0.8. Lastly, No 3–2 cannot rivefrom No 2–2; it crivefrom any other Ye3 no; for example, No 3–2 crivefrom No 3–4 (equto the proof No 3–4 ane4σe4\sigmae4σ ).no4-1到4-5应该是16倍啊！能不能画图说明一下，大家都在问
我还是不太明白为什么是0.8.no 4-1 到4-5是不是 2倍+2倍+2倍+2倍=8倍再乘以volatility所以e的8*0.1？而不是2*2*2*2
看提问里回答怪怪的，b答案e0.8不对？10%波动率，乘以8个倍，哪里不对？问
No 2+2aporoximate 1yeforwarrate 2 yefrom now 可否把知识点再写一下
