I believe the correct answer is the 27th day, since it goes up three each day and down 2 each day. Kinda like this
Day 1: Up 3 - 2 = 1
Day 2: Your starting point is now 1. 1 + 3 - 2 = 2
And then it would keep on going up by ones until you reached day 27. Then it will be Day 27: 27 + 3 - 2. However on that day the rabbit would've already reached the top of the well and would not have slid down the two meters. Hope this long kinda confusing explanation is correct and helpful.
-TTL
