1. The problem statement, all variables and given/known data This isn't a homework question, and in fact I have not yet taken probability, so I know very little about it. With that in mind, any attempts to "lead me through" this problem will almost definitely fail, so if you could just tell me, that would be best. If the probability that it will rain any during the time 2-3 pm is 50/50 rain/sun, and the probability that it will rain any during the time from 3-4 pm is also 50/50, and the probability that it will rain any during the 22 remaining one hour blocks is 0, what is the probability that it will rain any over 24 hours? What if instead of 50/50, the rain chance for each of the two rainable hours is 30%? 3. The attempt at a solution So, I was thinking, possible outcomes over favorable outcomes, right? And so it could either rain not at all, rain at 2-3 but not 3-4, rain at 3-4 but not 2-3, or rain both 2-3 and 3-4, all equally likely. This gives 3 favorables over 4, so 75 % chance of rain. But that seemed high. Thoughts? I wouldn't know how to calculate the 30% scenario.