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The target-mass number dependence of nucleon-nucleon pairs with short-rangecorrelations is explored in a physically transparent geometrical model within azero-range approximation. The observed $A$ dependence of 2-nucleon ejectioncross sections in $(e,e')$ reactions is found to reflect the mass dependence ofnuclear density distributions. A parametrization of this $A$ dependence isgiven. The $A$ dependence of proton-proton vs.\ proton-neutron pairs relativeto $^{12}$C is also analyzed in this model. It can be understood using simplecombinatorics without any additional isospin dependence.

Mass dependence and isospin dependence of short-range correlated pairs