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02: Consider a line axis where there are blocks at positionx - 3 and x--3 and a point moves along the axis. Every time the point at position x (-3 <x <3) can either move left (x 1) with probability of 0.5 or move right (x + 1) with probability of 0.5. However, it cannot penetrate the block (e.g., at position x- 3, if the point keeps moving right, it stays in the same position. This situation still counts one move). Starting from x- 0, what is the probability of the point being at position x-0 after 8 moves? left right 3 2 1 01 23

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