Question: A child makes a random walk on a square lattice of lattice constant 'a' taking a step in the north, east, south or west

A child makes a random walk on a square lattice of lattice

A child makes a random walk on a square lattice of lattice constant 'a' taking a step in the north, east, south or west direction with probabilities o.255, 0.255, 0.245, 0.245, respectively After a large number of steps, N, the expected bosition of child wirt starting point is at a distance:

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