问题如下图：
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解释：
请问一下这道题的题干如何理解呢？谢谢
NO.PZ2018062016000095 问题如下 Using two-periobinomimol, Jawants to calculate the terminvalue of a put option. If the current priof the unrlying asset is $150 anthe strike priis $120, the size of up move is 1.69 ana wn move is 0.59. Only when the priis below the strike pricthe option ha positive value, otherwise the value will zero. How many terminnos cgive bapositive return？ A.1 B.2 C.0 A is correct. Only the thirno ha value less th$120, whiis $52.22. \"cgive bapositive return\"是指期权本身是positive return吗？因为只有2个nos是行权了，所以这时期权return是positive？
NO.PZ2018062016000095问题如下 Using two-periobinomimol, Jawants to calculate the terminvalue of a put option. If the current priof the unrlying asset is $150 anthe strike priis $120, the size of up move is 1.69 ana wn move is 0.59. Only when the priis below the strike pricthe option ha positive value, otherwise the value will zero. How many terminnos cgive bapositive return？A.1B.2C.0A is correct. Only the thirno ha value less th$120, whiis $52.22.讲课里不是说二叉树不考吗，稍微带过了，为什么习题里有，所以到底是不是考试范围
NO.PZ2018062016000095 问题如下 Using two-periobinomimol, Jawants to calculate the terminvalue of a put option. If the current priof the unrlying asset is $150 anthe strike priis $120, the size of up move is 1.69 ana wn move is 0.59. Only when the priis below the strike pricthe option ha positive value, otherwise the value will zero. How many terminnos cgive bapositive return？ A.1 B.2 C.0 A is correct. Only the thirno ha value less th$120, whiis $52.22. 不是经过了两轮了吗？为什么不是2。请老师解答一下谢谢
NO.PZ2018062016000095问题如下Using two-periobinomimol, Jawants to calculate the terminvalue of a put option. If the current priof the unrlying asset is $150 anthe strike priis $120, the size of up move is 1.69 ana wn move is 0.59. Only when the priis below the strike pricthe option ha positive value, otherwise the value will zero. How many terminnos cgive bapositive return？A.1B.2C.0A is correct. Only the thirno ha value less th$120, whiis $52.22.请问一般就是三期吗？还是说算到上下有交叉值了结束啊
NO.PZ2018062016000095问题如下Using two-periobinomimol, Jawants to calculate the terminvalue of a put option. If the current priof the unrlying asset is $150 anthe strike priis $120, the size of up move is 1.69 ana wn move is 0.59. Only when the priis below the strike pricthe option ha positive value, otherwise the value will zero. How many terminnos cgive bapositive return？A.1B.2C.0A is correct. Only the thirno ha value less th$120, whiis $52.22.老师请问题干哪里有说只考虑最后一期？ 88.5为什么不行？
