  An equation of state for a multicomponent mixture of non-additive hard
spheres in $d$ dimensions is proposed. It yields a rather simple density
dependence and constitutes a natural extension of the equation of state for
additive hard spheres proposed by us [A. Santos, S. B. Yuste, and M. L\'opez de
Haro, Mol. Phys. 96, 1 (1999)]. The proposal relies on the known exact second
and third virial coefficients and requires as input the compressibility factor
of the one-component system. A comparison is carried out both to another recent
theoretical proposal based on a similar philosophy and to the available exact
results and simulation data in $d=1$, 2, and 3. Good general agreement with the
reported values of the virial coefficients and of the compressibility factor of
binary mixtures is observed, especially for high asymmetries and/or positive
nonadditivities.
