输血:
the range of list P is 15, the range of list S is 17, and then combine list P & S, what is the least possible value of the combined list? 选项有2/15/17/30/32.
埃啊:
一个地方 snow but not rain 的概率10%, rain but not snow 20%. What is the probability that (1)this place is snow and rain / (2)either snow or rain or both?