Here's how I thought about it. Not sure if the answer is correct or not.
Obviously the first person to sit down can choose from 20 seats. The second person can then choose from any of the 17 remaining chairs. The tricky part is that, of the 17 choices for the second person, not all leave the...
Actually that's not correct either. Distance from the sun doesn't have anything to do with the seasons. Relatively speaking, the change in distance due to the tilt of the earth's axis is extremely tiny when compared to the distance to the sun.
What is important is that the tilt affects the...