Answer: There are 6 possible routes as a result of their choices.
Explanation:
Since we have given that
Total number of different campgrounds along the way = 3
As we have, After choosing the campground for their first stop, they must select from three possibilities for their second day, and two for their third day.
So, the number of possibilities as a result of their choices is given by

Hence, there are 6 possible routes as a result of their choices.