Final answer:
The problem is described as a search problem, with an initial state, actions, goal state, transition model, and cost. The size of the state space is 2^144.
Step-by-step explanation:
The formal description of the wall painting problem as a search problem is as follows:
- The initial state: an empty wall with all squares unpainted.
- The actions: paint a single square and move the hand to the next square.
- The goal state: a fully painted wall.
- The transition model: each action (painting a square and moving) leads to a new state.
- The cost: the number of actions taken.
The size of the state space can be calculated by considering the number of possible configurations of the wall. Since there are 144 squares and each square can be in one of two states (painted or unpainted), the size of the state space is 2^144, which is an extremely large number.