2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/168654We present tight Bell inequalities expressed by probabilities for three four- and five-dimensional systems. The tight structure of Bell inequalities for three $d$-dimensional systems (qudits) is proposed. Some interesting Bell inequalities of three qubits reduced from those of three qudits are also studied.8 pages, 3 figures. Accepted for publication in Phys. Rev. AQuantum Physicstext