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The number of particles given by n = D (...

The number of particles given by `n = D (n_2 - n_1)/(x_2 - x_1) ` are crossing a unit area perpendicular to x-axis in unit-time.`n_1` and `n_2` are the number of particles per unit volume for the values of x meant to be `x_1` and `x_2`.What is the dimensional formula of diffusion constant D?

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