Andres Riofrioless info
|visits||member for||1 year, 1 month|
|seen||Dec 9 '12 at 6:13|
What's the probability of an event happening exactly once after two independent trials?
It's actually a made-up problem to understand this basic concept, so that I could do a more complex homework problem. :) Your hints could go both ways in my mind: "it doesn't matter" could be in the sense that "we should account for both" (2nd option) or "we are already accounting for both (1st option).