How to enter the Yellow River estuary of rivers and lakes?

Answer: According to the solution of probability, find two points: ① the total number of all equal possible situations; ② Number of eligible cases; The ratio of the two is the probability of its occurrence. So ∫ Xiaoming and Xiao Liang draw lots with nine other possible results, namely (Dongying Port, Dongying Port), (Dongying Port, Yellow River Estuary), (Dongying Port, Yue Long Lake), (Yellow River Estuary, Dongying Port), (Yellow River Estuary, Yellow River Estuary) and (Yellow River Estuary, Yue Long Lake). So choose a.