Hydrology question: one analysis has four events. the probability of first event is 0.2, probability of second event is 25%, and probability of third event is 3/8. what is the probability of fourth event?

Hey this is extremely !international aid debate for geography 10 will mark de brainliest! questions are down below plz put an answer and evidence for it. q1: what are the problems with international aid? q2: what are the alternatives to international aid? q3: what do you think is the best approach to offer international aid? ( answer these questions with credible answers and evidence)