Concept explainers
Random walks. Using a piece of graph paper, a penny, and a dime, embark on a random walk on the grid. Flip both coins. If the penny lands heads up, you move one unit to the right; if it lands tails up, you move one unit to the left. If the dime is heads, you move one unit up, and if it is tails, you move one unit down. Mark your trail on the graph paper as you make 50 flips of the coins.
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