Hello!
I'm sure that all the doors are distinguishable, i.e. "enter the first red door" and "enter the second red door" are different events.
Then we can 1) enter a red door, leave (through) a green door or 2) enter a green door, leave a red door. The quantities of path in this two options must be added.
There are green doors. For the option 1, we can enter each of
red doors and for each of them can leave through any of
green doors, so there are
paths. For the option 2, we can enter each of
green doors, leave through any of
red doors, again
paths.
And there are paths total. This is the answer.
No comments:
Post a Comment