【求助】这个题目是什么意思呢？怎么解呀？

The odds against the occurrence of an event are defined to be the ratio of the probability that the event will not occur to the probability that the event will occur.
An integer is to be selected at random from the set of integers from k to n, where k<n. The odds against the event that the integer selected will be an even integer are 1 to 0.95. Which of the following could be the integers k and n, respectively?

A 13 和 33
B 14 和 33
C 15 和 33
D 16 和 55
E  17和 55

E.
就是求奇数的概率/偶数的概率，也就是奇数的个数/偶数的个数=1/0.95=20/19
只有E符合

k和n之间奇偶个数比为20/19，暗示k和n之间有20+19=39个数，只有E符合（55-17+1=39）