16. Consider a 4×4 grid in the xy-plane (05x54) & (0<y?4). Arobot navigates the grid until it lands on its destination or it stops when the boundary of the grid is reached. Assume that for each move, it has an equal chance to either move up or move right one step. What is the probabilities that the robot, starting at point A (0,0) reaches point B (3,3)? ANS 20/30