Question: 12. Consider a symmetric random walk on the integer points of the cubic lattice {(i, j, k) : i, j, k = . . .

12. Consider a symmetric random walk on the integer points of the cubic lattice {(i, j, k) : i, j, k = . . . ,−1, 0, 1, . . . } in three dimensions, in which the particle moves to one of its six neighbouring positions, chosen with equal probability 1

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