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In random-interaction ensembles, the electric quadrupole moments (Q) and magnetic moments (μ) of the Iπ=11/2- isomers of the Cd isotopes predominantly exhibit a linear correlation with the neutron numbers, corresponding to the recently emphasized linear Q and μsystematics in realistic nuclear systems. Although the seniority scheme enhances such predominance (more essentially for μ), the configuration mixing due to quad-rupole-like and δ-force-like proton–neutron (pn) interac-tions is responsible for the linear Q and μ systematics, respectively, in realistic nuclear system, as well as random-interaction ensembles.